Choosing treatment

How long is rehab? Duration by type and what research says

Published July 1, 2025 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

By treatment type

Medical detox: 5-10 days. Residential: 28-90 days (30 days most common). PHP: 4-6 weeks. IOP: 8-12 weeks. Standard outpatient: ongoing.

What research says

NIDA recommends a minimum of 90 days (3 months) of treatment for meaningful behavioral change. Studies show treatment lasting less than 90 days has limited effectiveness. Longer treatment consistently produces better outcomes.

Why 30 days may not be enough

Thirty days addresses physical stabilization and introduces therapeutic concepts, but is often insufficient for the deep behavioral change needed for sustained recovery. Many people benefit from 60-90 day programs or stepping down through PHP and IOP after residential care.

The continuum

The most effective approach is not one episode of treatment but a continuum: detox, residential (if needed), PHP, IOP, outpatient therapy, recovery support. Total treatment engagement of 6-12 months produces the best long-term outcomes.

Authoritative sources

This article references guidelines from: SAMHSA · NIDA · ASAM

Frequently asked questions

How do I find the right program?

Call SAMHSA at 1-800-662-4357 or search our directory. Filter by your insurance, location, and treatment needs.

Does insurance cover treatment?

Most insurance covers substance abuse treatment under the Mental Health Parity Act.

How quickly can I get into treatment?

Many facilities admit within 24-72 hours. Call admissions directly for current availability.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.