Westbrook Recovery

How Long Is Rehab?

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Rehab lasts anywhere from under a week to a year or more, depending on the level of care. Medical detox runs 3 to 7 days. Residential or inpatient rehab is most often 30, 60 or 90 days. Outpatient programs typically run 8 to 12 weeks, and intensive outpatient about the same at fewer hours per week. Methadone maintenance is the outlier: federal guidance treats 12 months as the minimum. Across all of these, the research benchmark is 90 days of treatment in any combination of settings; participation shorter than that is of limited effectiveness. The right length for one person is set by the substance, the severity, co-occurring conditions, and what insurance will authorize.

The short version

  1. Detox is measured in days, treatment in weeks or months — detox clears the substance in 3 to 7 days; it does not treat the disorder itself
  2. Residential stays are 30, 60 or 90 days — the 30-day default is an insurance artifact more than a clinical finding
  3. Outpatient runs 8 to 12 weeks on the calendar — fewer hours per week means the same dose of treatment is spread over more weeks
  4. 90 days is the evidence threshold — NIDA: participation under 90 days, across all settings combined, is of limited effectiveness
  5. Methadone maintenance starts at 12 months — federal guidance sets a year as the minimum, and many patients stay longer
Range chart of how long each level of care usually lasts: medical detox 5 to 7 days, residential 30 to 90 days, intensive outpatient 8 to 12 weeks, methadone maintenance 12 months minimum
The ranges are published guidance, not averages. Nobody has measured the actual national average length of a treatment episode.
Bar chart of our deduplicated count of the SAMHSA directory: outpatient 8,740 facilities, residential 2,185, medical detox 1,996, hospital inpatient 602 of 10,233 total, pulled 2026-08-25
Long levels are the scarce tiers. If you are quoted a wait for a residential bed, the arithmetic on this chart is why.
Diagram of the 90-day threshold: participation under 90 days is of limited effectiveness, 90 days and more is the recommended minimum across settings combined
The 90 days count across settings combined: detox plus residential plus outpatient. Methadone maintenance is the exception at 12 months minimum.
Diagram of the step-down pathway through addiction treatment: detox, residential, partial hospitalisation, intensive outpatient, then outpatient and aftercare
Nobody needs every step. The ladder exists so that support can be reduced as stability improves, not so that everyone starts at the top.
Checklist of the six ASAM assessment dimensions: withdrawal risk, medical conditions, emotional and behavioural conditions, readiness to change, relapse potential, and recovery environment
This is the framework US programmes and insurers actually use. The sixth dimension — what home is like — is the one families most often underestimate.

How widely each level of care actually exists

Our analysis

How long rehab lasts is limited by what exists near you, and the levels are not equally available. We counted the federal treatment directory ourselves, deduplicated to 10,233 facilities in the pull dated 2026-08-25, so the scarcity below is measured rather than assumed. Hospital inpatient care, the scarcest tier at 602 facilities (5.9%), is reserved for medically severe cases.

8,740
facilities offer outpatient care
85.4% of all facilities: the level that is easiest to start quickly and keep longest
2,185
offer residential treatment
21.4%: the level with the 30 to 90 day stays is offered by about one facility in five
1,996
offer medical detox
19.5%: the shortest level of care, and not the default entry point everywhere

How we got this: we pulled the full public listing from SAMHSA’s FindTreatment.gov on , removed duplicate entries by name, street and ZIP, and counted how many of the 10,233 remaining facilities report each service. SAMHSA publishes the directory; it does not publish these proportions — see how the count is made. Repeat the pull and you will get the same numbers, give or take facilities that opened or closed since.

What these numbers cannot tell you: they are self-reported by facilities, they describe availability rather than quality, and a national proportion says nothing about what is open near you this week. Use them to know what to ask for, not to decide where to go.

The short answer: length by level of care

There is no single length called rehab. There are four levels of care, each with its own typical duration, and a real episode of treatment usually stacks two or three of them in sequence. Someone might spend 5 days in detox, 30 days in residential care and 10 weeks in an outpatient program: a calendar total of about four months, of which only the middle month looked like what films call rehab. The table below is the reference for the rest of this page. Every range in it is published guidance, not a measured national average, because no national measurement of actual episode length exists.

  • Medical detox

    Usual duration
    3 to 7 days
    Time commitment
    24 hours a day, inpatient
    What it is for
    Safe withdrawal; the start, not the treatment

  • Residential / inpatient rehab

    Usual duration
    30, 60 or 90 days
    Time commitment
    Live-in, full days
    What it is for
    Stabilization and daily therapy away from triggers

  • Partial hospitalization (PHP)

    Usual duration
    2 to 6 weeks
    Time commitment
    About 6 hours a day, 5 days a week
    What it is for
    Step down from residential, or up from outpatient

  • Intensive outpatient (IOP)

    Usual duration
    8 to 12 weeks
    Time commitment
    9 to 12 hours a week
    What it is for
    Treatment while living at home and working

  • Standard outpatient

    Usual duration
    Months, open-ended
    Time commitment
    1 to 2 sessions a week
    What it is for
    Maintenance and relapse prevention

  • Methadone maintenance

    Usual duration
    12 months minimum
    Time commitment
    Daily dosing at a clinic
    What it is for
    Opioid use disorder; often continues for years
How long each level of care usually lasts: published ranges from NIDA, SAMHSA TIP 45 and the ASAM Criteria

Why the honest answer is a range

Length is prescribed, not fixed. A treatment team sets an initial plan from the assessment and then extends or shortens it based on progress, which means two people entering the same facility on the same day can leave a month apart. Published ranges describe what programs typically offer; what one person actually needs is an individual answer, and the sections below give you the inputs that decide it.

What a week looks like at each level

The durations differ because the weeks differ. A residential week is seven full days of scheduled therapy, groups and medical oversight. An intensive outpatient week is three evening sessions after work. Counting only weeks hides this: 12 weeks of IOP delivers roughly the same scheduled hours as two weeks of residential care. That is why outpatient episodes run longer on the calendar and why comparing raw week counts between levels misleads.

How long does detox take?

Detox is the shortest level of care: typically 3 to 7 days, occasionally up to 10 for complicated withdrawals. It clears the substance and manages withdrawal safely. It is the entrance to treatment, not the treatment, and the national guidelines are blunt about it: detox alone, without follow-on care, rarely changes the course of the disorder. For the full comparison of what detox does and does not do, see detox versus rehab.

Alcohol and benzodiazepine detox

These two run 5 to 7 days when medically managed, and they are the withdrawals that can kill, which is why they belong in a medical setting. Alcohol withdrawal seizures peak in the first 24 to 72 hours; benzodiazepine withdrawal starts later and stretches longer, sometimes requiring a taper measured in weeks rather than a fixed detox stay. SAMHSA TIP 45 is the standard reference clinicians use for these timelines.

Opioid and stimulant detox

Opioid withdrawal is rarely life-threatening and is usually managed in 3 to 7 days, though the discomfort drives many people to leave early unless medication is used. Stimulant withdrawal, from methamphetamine or cocaine, has no approved medication and mostly involves sleep, appetite and low mood over days to a couple of weeks. In both cases the detox stay is short; the treatment that follows it is what takes the months.

Why detox alone is not enough

The research record on detox without follow-up is consistent: relapse rates within a month are high, because withdrawal management does nothing to the learning, habit and circumstance that maintained the addiction. Plan detox as the first week of a longer episode. If a facility offers you detox with no arranged next step, the next step is your job to arrange, and the sections below on residential and outpatient care are what you are choosing between.

How long is inpatient rehab?

Residential or inpatient rehab, where you live at the facility, is most often sold and authorized in blocks of 30 days, with 60 and 90 day options at many facilities. In our count of the federal directory, 2,185 facilities offer residential care, about one in five of all providers, so the length you can get sometimes depends on how far you can travel. Insurance authorization, not just clinical judgement, often sets the initial number: insurers commonly approve a first block and require reviews for extensions.

  • 30 days

    Commonly used for
    Stabilization, a full therapy cycle, discharge planning
    Honest limitation
    Falls well short of the 90-day evidence threshold on its own

  • 60 days

    Commonly used for
    Deeper work on co-occurring conditions and relapse patterns
    Honest limitation
    Costs and insurance pushback roughly double

  • 90 days

    Commonly used for
    Meets the NIDA threshold within a single stay
    Honest limitation
    Few facilities and fewer insurers default to it; work and family logistics are hardest
What the three common residential blocks are typically used for

What 30, 60 and 90 days actually buy you

Thirty days buys stabilization: withdrawal is behind you, a therapy routine exists, and a discharge plan is written. Sixty days buys repetition, which is where new habits start to hold. Ninety days is the point where the stay itself meets the duration the research associates with better outcomes. None of this is a guarantee in either direction; people relapse after 90 days and succeed after 30. The dose-response relationship is real but statistical, not personal fate.

How long you can stay if you need longer

Long-term residential programs exist beyond the 90-day mark, running 6 to 12 months, usually as therapeutic communities; long-term drug rehab covers those models and their evidence. They are a different product from the 30-day model and are typically considered after repeated shorter stays have not held. If cost is the constraint on length, paying for rehab without insurance walks through the funding routes that change what is affordable.

How long is outpatient rehab?

Outpatient treatment runs 8 to 12 weeks for an intensive outpatient program and 2 to 6 weeks for the more hour-heavy partial hospitalization level, with standard outpatient counseling continuing for months after that. Outpatient is the most available level by far: 8,740 facilities in our count, 85.4% of all providers. The calendar length is longer than residential for the same reason the weekly hours are shorter: treatment dose is hours of therapy, and outpatient spreads those hours thin.

PHP and IOP hours per week

The ASAM levels are defined by hours. Partial hospitalization means roughly 20 or more hours a week, often 6 hours a day on weekdays. Intensive outpatient means 9 to 12 hours a week, commonly three 3-hour sessions. Standard outpatient is 1 to 2 sessions a week. When a facility quotes you 8 weeks or 12 weeks, ask which level and how many weekly hours, because those two numbers tell you the real dose far better than the week count. PHP versus IOP compares the two levels in detail.

Why outpatient episodes stretch longer

An IOP episode of 10 weeks at 9 hours a week delivers about 90 scheduled hours, roughly what a residential program delivers in its first two weeks. That is not an argument against outpatient: living at home, keeping a job and practicing recovery in the environment where you will actually stay sober are advantages residential care cannot offer. It is an argument for reading outpatient length as a different unit, and for not treating 12 weeks of IOP as equal to 12 weeks in residence.

How long is drug rehab versus alcohol rehab?

The level of care decides the length more than the substance does, but the substance shifts which level you start at and how long the early phases run. Alcohol addiction more often requires a medical detox first because the withdrawal is physically dangerous. Opioid addiction has a medication pathway that extends treatment to a year or more by design. Stimulant addiction has no detox medication at all, so the timeline leans on behavioral treatment from day one.

Alcohol

Alcohol rehab typically starts with 5 to 7 days of medical detox, because withdrawal can cause seizures, then moves to 30 or more days of residential or 8 to 12 weeks of outpatient care. NIAAA notes that medication such as naltrexone or acamprosate may continue for months after the intensive phase, and that ongoing mutual-help participation is common for years. The intensive phase is weeks; the maintenance that follows is open-ended, and treating it as finished at day 30 is the common mistake.

Opioids

For opioid use disorder, the longest timelines are the standard of care, not the exception. Methadone maintenance carries a federal minimum recommendation of 12 months, and buprenorphine is commonly continued for a year or longer because stopping early is associated with relapse. A 30-day program without medication is the short option and has the weakest evidence. When someone asks how long opioid rehab takes, the honest answer includes medication time, which is measured in months and years.

Stimulants and other drugs

Methamphetamine and cocaine treatment runs the same 30 to 90 day residential or 8 to 12 week outpatient ranges, but the withdrawal phase is milder physically and heavier psychologically: weeks of low mood, fatigue and disturbed sleep rather than dangerous acute symptoms. No approved medication exists for stimulant use disorder, so length of stay buys therapy hours, and the evidence-backed approaches are behavioral, principally contingency management.

The 90-day threshold: what the evidence says

The single most cited finding about treatment length comes from the National Institute on Drug Abuse: participation for less than 90 days is of limited effectiveness, and treatment lasting significantly longer is recommended. Two details matter. First, the 90 days count across settings combined: detox plus residential plus outpatient stacked together. Second, 90 days is a floor associated with better outcomes, not a ceiling. For methadone maintenance the same guidance sets 12 months as the minimum.

What NIDA actually says

The exact sentence, from the Principles of Drug Addiction Treatment, is that research indicates most people need at least 3 months in treatment to significantly reduce or stop drug use, and that better outcomes are associated with longer stays. It also notes that recovery from addiction is a long-term process that frequently requires multiple episodes. That framing, episodes plural, is the part the 30-day marketing model leaves out: readmission is common, and a second episode is a known part of the process rather than proof the first one was worthless.

Why a shorter stay still counts

A 30-day program followed by 10 weeks of outpatient care is about 100 days of treatment, which clears the threshold. This is the practical reading of the evidence: the number applies to the episode, not to one building. The way to fail the threshold is to treat discharge from a 28-day stay as the end of treatment. The way to clear it on a normal budget and a normal job is the step-down sequence described in the planning section below.

What decides how long your rehab lasts

Five factors do most of the deciding. Some are clinical and assessed at intake; others are practical and set by your insurer, employer and budget. Knowing which factor is binding in your case tells you where to push: a clinical limit argues for more care, an insurance limit argues for appeals and alternative funding, and a logistics limit argues for outpatient formats.

  • Substance and withdrawal risk

    Pushes longer when
    Alcohol, benzodiazepines: detox plus longer stabilization
    Pushes shorter when
    Stimulants with stable housing
    Your leverage
    None; it is assessed, not chosen

  • Severity and history

    Pushes longer when
    Years of use, prior relapses, prior episodes
    Pushes shorter when
    First episode, short history
    Your leverage
    Honest intake answers change the plan

  • Co-occurring conditions

    Pushes longer when
    Depression, PTSD, anxiety treated alongside
    Pushes shorter when
    No dual diagnosis
    Your leverage
    Ask whether the program treats both

  • Insurance authorization

    Pushes longer when
    Plan approves extensions on review
    Pushes shorter when
    Plan caps days at 28 to 30
    Your leverage
    Appeals, medical necessity letters, [appealing a denial](/insurance)

  • Work, money, caregiving

    Pushes longer when
    FMLA leave, savings, family support
    Pushes shorter when
    No leave, no coverage, dependents at home
    Your leverage
    Outpatient formats keep income flowing
The five factors that set length of stay, and which ones you can influence

The clinical factors

Intake assessment scores severity across substance, duration, prior treatment, physical health and mental health. Each pushes length in the same direction: more severity, more time. Co-occurring depression or trauma roughly doubles the work, because the program is treating two conditions that feed each other. Prior failed short stays are themselves a clinical argument for a longer one, and saying so at intake is legitimate self-advocacy rather than gaming the system.

The practical factors

Insurance is usually the binding constraint on residential length: plans authorize in blocks and require utilization review for extensions, so day 30 arrives regardless of what day 30 was supposed to mean clinically. Work is the second constraint; the federal FMLA protects up to 12 weeks of unpaid leave for treatment at covered employers, which maps neatly onto the 90-day threshold if you qualify. Money and caregiving responsibilities push toward outpatient formats, which trade calendar length for compatibility with a life you cannot pause.

Why 30 days became the default

The 30-day model spread because insurers and employers could administer it, not because research found 30 days optimal. It descends from the Minnesota Model of the 1940s and 1950s, where four weeks of residential abstinence-based treatment fit hospital billing cycles and workplace absence policies. Insurance coverage then froze the pattern: 28 to 30 days became the standard authorization unit. The research consensus arrived later and pointed at 90 days, which is why the modern standard pairs a 30-day residential start with outpatient continuation rather than treating day 30 as a cure date.

What a 30-day program is good for

Used as designed today, 30 days is a strong start: safe withdrawal behind you, a therapy routine established, a relapse-prevention plan written, and a handoff to continuing care arranged. It is a foundation. The failure mode is expecting it to be the whole structure, which the evidence does not support and most clinicians no longer claim.

When to push for more

Ask for a longer authorization when the clinical factors above stack up: co-occurring conditions, multiple prior episodes, an unsafe home environment, or opioid use disorder without a medication plan. The request goes through the facility utilization review process, and it works more often than families assume, because insurers respond to documented medical necessity. If the answer is no, the fallback is the step-down path: move to PHP or IOP and let the calendar, not the building, supply the remaining days.

How to plan for the full length

The planning mistake is budgeting money, leave and family logistics for one number. Plan for the episode instead: the acute phase in weeks, the continuation phase in months, and the maintenance phase as ongoing. The sequence below is the standard architecture, and each stage has its own cost, schedule and insurance conversation. What happens in rehab describes the daily content of the first stage; this section is about the calendar of the whole thing.

The step-down sequence

Detox (days) leads to residential or PHP (weeks), which leads to IOP (weeks to months), which leads to standard outpatient and mutual help (months, ongoing). Each step cuts hours and cost while keeping continuity. This is how the 90-day threshold is met in practice, and it is also how insurers prefer to pay: the expensive level first, the cheap levels after. A facility that plans your discharge at admission, naming the next level and the provider who will deliver it, is showing you the architecture working as intended.

Questions to ask before you commit

Ask five questions of any program: what level of care is this and how many hours per week; what length do you recommend for my assessment, not in general; how do you handle insurance extensions at day 28; what is the step-down plan and who delivers it; and what happens if I leave early or relapse during the program. The answers tell you whether the quoted length is a clinical plan or a billing unit, and they surface the real calendar before you have committed leave and money to the wrong number.

Bar chart of how many US treatment facilities offer each level of care: outpatient 85.4%, residential 21.4%, medical detox 19.5%, hospital inpatient 5.9%
Outpatient care is nearly universal; residential and detox are the scarce tiers. That scarcity is part of why they cost what they do and why waits exist.
Bar chart of medication for opioid use disorder availability: buprenorphine at 59.2% of facilities, methadone at 13.7%, certified opioid treatment programmes at 12.8%
The four-to-one gap between buprenorphine and methadone availability is a regulatory fact, not a clinical judgement about which works better.
Five-step diagram of prior authorisation: clinical assessment, request submitted by the facility, plan review within about 72 hours, decision, then concurrent review
Admission before authorisation is one of the most common reasons a claim is refused outright. Confirm in writing who is submitting it.
Checklist of six questions to ask a treatment facility about network status, prior authorisation, all-in cost, medication availability, aftercare and accreditation
How plainly a programme answers these is itself information about how it operates.

Where this sits in the system of care

Addiction treatment is organised into levels of care, and clinicians choose between them using the ASAM criteria (six dimensions covering withdrawal risk, medical and psychiatric conditions, readiness, relapse risk and, decisively, the environment you return to. Facilities are licensed by the state and many hold additional accreditation from bodies such as the Joint Commission or CARF; that status is worth confirming for any specific programme. Percentages below are our count of how many facilities in the federal directory report offering each level of care.

  1. Detox19.5% of facilitiesmedical withdrawal management, 3–7 daysDetox vs rehab
  2. Residential21.4% of facilitieslive on site, 24-hour staffingInpatient vs outpatient
  3. PHP20–30 structured hours a week, sleep at homePHP vs IOP
  4. IOP9–19 hours a week, usually compatible with workPHP vs IOP
  5. Standard outpatient85.4% of facilities1–8 hours a week, the maintenance levelMutual aid options
“Remaining in treatment for an adequate period of time is critical.”

Programmes for specific groups

Facilities also report dedicated programming, and the coverage is wider than most people expect, worth asking about before assuming a programme will not fit. From our count: 42.7% run programmes for adolescents, 39.2% for veterans, 38% for pregnant and postpartum women, and 25% provide services in Spanish. Medication for opioid use disorder is available at 59.2% (buprenorphine) and 13.7% (methadone).

Cost and coverage vary by level: residential care is the tier insurers scrutinise most and almost always requires prior authorisation before admission. See what your plan covers and how to pay without insurance. Family involvement is a standard part of most programmes, and aftercare planning ( step-down to a lower level, sober living, relapse prevention) should be discussed before admission, not at discharge. If a mental health condition is also present, ask specifically whether the programme is staffed for co-occurring disorders: 69.5% of facilities in the directory report treating them, but that is a self-reported field worth confirming.

Bar chart of payment types accepted by US addiction treatment facilities: cash 91.6%, private insurance 80.7%, Medicaid 83.4%, Medicare 55.2%, state-financed 54.5%, military 49.6%, sliding scale 40.0%, payment assistance 22.5%
Accepting your insurer is not the same as your plan covering the level of care you need. The two questions have to be asked separately.
Three figures: 69.5% of facilities treat co-occurring disorders, 59.8% offer trauma-informed care, 19.5% run medical detox
Co-occurring capability is self-reported. Ask what it means concretely, which clinicians are on staff, and whether psychiatric medication can be prescribed and reviewed on site.
Bar chart of dedicated programming reported by US treatment facilities for older adults, women, men, trauma-informed care, criminal justice referrals, adolescents, veterans, pregnant women and Spanish-language services
Coverage is wider than most people assume. It is worth asking rather than ruling a programme out on the assumption it will not fit.
Table showing when to call 911, 988 or the SAMHSA National Helpline for overdose, immediate danger, suicidal thoughts, severe distress and treatment questions
All three are free and staffed around the clock. 988 is the Suicide & Crisis Lifeline; the SAMHSA National Helpline is 1-800-662-4357.

Common questions

Is 30 days of rehab enough?

On its own, usually not. The research benchmark is 90 days of treatment in any combination of settings. Thirty days works as the first stage: follow it with intensive outpatient care and the episode clears the threshold. Treating day 30 as the finish line is the version the evidence does not support.

How long can you stay in inpatient rehab?

Standard residential programs run 30, 60 or 90 days, and long-term therapeutic communities run 6 to 12 months. The practical limit is usually insurance authorization rather than the facility: plans approve in blocks and require reviews for extensions, so longer stays involve appeals built on documented medical necessity.

How long does outpatient rehab last?

Intensive outpatient programs typically run 8 to 12 weeks at 9 to 12 hours per week. Partial hospitalization is shorter on the calendar, 2 to 6 weeks at about 20 hours per week. Standard outpatient counseling then continues for months at one or two sessions a week. The calendar is longer because the weekly dose is smaller.

Does insurance decide how long rehab lasts?

Often, yes, at least initially. Insurers commonly authorize a first block of 28 to 30 days and require utilization review for more. Extensions are granted when the treatment team documents medical necessity, so the quoted length is a starting authorization rather than a hard cap. Appeals and step-down to outpatient levels are the two standard routes when coverage ends before the clinical plan does.

What happens if you leave rehab early?

Leaving against medical advice is legally your right in almost all cases, but it ends the episode before the planned dose is delivered, and early departure is one of the strongest predictors of quick relapse. If the program is a poor fit, the better move is a planned transfer to another facility or a step down to outpatient care, which keeps the episode running instead of ending it.

Sources

Compare levels of care

Check what your plan covers

How this page was made

Who wrote it:
the Westbrook Recovery editorial team : researchers and writers, not clinicians. No doctor has reviewed this page, and we do not claim otherwise. What that means in practice: we report what public clinical sources say and show you where to read them, rather than offering a clinical opinion of our own.
Checked against:
6 primary sources listed above: federal agency material and published clinical criteria. Where a figure varies by state, plan or facility, we say so instead of publishing a number that looks authoritative and is not.
Original analysis:
the facility proportions on this page are our own count of SAMHSA’s public directory. The full method is documented , including what we count, what we deliberately do not publish, and an error the approach caught. You can repeat the pull and check the numbers.
Last reviewed:
. This date changes when the content is actually re-checked, not automatically on every visit.
What this page is not:
a medical recommendation, a diagnosis, or a referral. Decisions about levels of care and medication belong with a clinician who knows your history. We do not operate facilities, take placement fees, or receive payment for sending anyone anywhere.

Related on this site

More guides

Weighing levels of care? See PHP vs IOP and what your insurance covers.

This page is information, not medical or legal advice. Laws on commitment and treatment differ by state. If you are in crisis, call or text 988 in the US, or reach the SAMHSA National Helpline at 1-800-662-4357 — free, confidential, 24/7.