Choosing treatment
How long does rehab last? Program lengths explained
Treatment program length varies by level of care, clinical need, and insurance coverage. Here is what to expect at each level — and what the research says about how long is enough.
Medical detox: 5-7 days
Detox is the shortest phase of treatment — focused solely on safe withdrawal management. Alcohol detox typically takes 5-7 days. Opioid detox takes 5-10 days. Benzodiazepine tapers may take weeks to months. Detox alone is not treatment — it is medical stabilization that prepares you for therapeutic care.
Residential treatment: 28-90+ days
The traditional 28-day program originated from insurance conventions, not clinical science. Research consistently shows that longer residential stays produce better outcomes. 28-30 days provides stabilization, introduction to therapy, initial psychiatric evaluation, and a preliminary relapse prevention plan. 60 days adds deeper therapeutic work, medication stabilization, and more time to practice new skills. 90 days is the benchmark recommended by NIDA for significant behavioral change. Most studies show substantially lower relapse rates at 90+ days.
Partial hospitalization (PHP): 4-6 weeks
PHP provides 6-8 hours of daily treatment, 5 days per week, while you return home each evening. It is a step down from residential or an alternative for people who need more than IOP but have stable living situations.
Intensive outpatient (IOP): 8-12 weeks
IOP provides 9-20 hours per week, typically 3-5 days per week. It allows you to continue working and living at home while receiving structured treatment. Many people transition from residential to IOP to extend their total treatment time.
Outpatient therapy: Months to years
Ongoing weekly or biweekly therapy provides long-term support. Many people continue outpatient therapy for 6-12 months after completing intensive treatment. Some continue for years as maintenance.
The insurance reality
Most insurance plans initially authorize 28-30 days of residential treatment. Extensions require documented medical necessity from your treatment team. A common strategy is stepping through multiple levels: 30 days residential → 4-6 weeks PHP → 8-12 weeks IOP → ongoing outpatient. This achieves 90+ days of total treatment while working within insurance frameworks.
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Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.