How Long Does Rehab Last?

Last reviewed 2026-08-01

There's no fixed answer — treatment length depends on the level of care, the substance involved, and clinical progress, not a calendar date set in advance. That said, here's roughly how long each stage tends to run.

DetoxTypically 3–10 days, depending on the substance and withdrawal severity.

Residential / InpatientCommonly 28, 60, or 90 days — though clinical need, not a fixed formula, determines the actual length.

Partial Hospitalization (PHP)Often several weeks, with treatment most days of the week for several hours a day, while living off-site.

Intensive Outpatient (IOP)Typically 8–12 weeks, several sessions a week, stepping down in intensity over time.

Standard OutpatientCan continue for months, often at a lower weekly time commitment, as a long-term maintenance step.

AftercareOften ongoing indefinitely — support groups, alumni programs, and periodic check-ins have no fixed end date.

Why length varies so much

Research generally associates longer engagement in treatment with better outcomes, but "longer" isn't automatically "better" for every individual — a program should be basing length on clinical reassessment, not a one-size-fits-all package. If a program offers only one fixed length regardless of how you're doing, that's worth asking about directly — see our how to choose a rehab guide for the fuller list of questions.

Frequently Asked Questions

How long does medical detox usually take?

Detox typically takes 3 to 10 days, depending on the substance involved and the severity of withdrawal.

How long is a typical inpatient rehab stay?

Inpatient or residential programs commonly run 28, 60, or 90 days, though the actual length should be determined by clinical need and reassessment rather than a fixed formula.

How long does intensive outpatient (IOP) treatment last?

Intensive outpatient programs typically run 8 to 12 weeks, with several sessions a week, stepping down in intensity over time.

Does aftercare have an end date?

Not usually. Aftercare — support groups, alumni programs, and periodic check-ins — is often ongoing indefinitely rather than ending on a fixed date.

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This guide is for general education only and is not medical advice. If you or someone you know is in crisis, call or text 988.