The short answer
There is no single length. Detox usually takes several days to about a week, and treatment after it often runs for weeks to months, depending on the level of care and how the person is doing. Many people then stay connected to some kind of support for much longer.
The National Institute on Drug Abuse (NIDA) says staying in treatment long enough is critical, and that no single treatment is right for everyone. So instead of asking how many days, ask how long your loved one needs at each level of care.
How long each level of care often lasts
| General length | What usually decides it | |
|---|---|---|
| Detox | Several days to about a week | The substance, how much and how long it was used, and overall health |
| Residential | Often weeks to a few months | Progress, safety at home, plan approval |
| Partial hospitalization (PHP) | Often a few weeks | Whether symptoms settle enough to step down |
| Intensive outpatient (IOP) | Often several weeks to a few months | Attendance, stability, work and family demands |
| Outpatient | Months, sometimes longer | Goals, relapse risk, ongoing mental health needs |
| Aftercare and support | Months to years, and it can be open-ended | What helps the person stay well |
Why you keep hearing 30, 60 or 90 days
Those numbers are common program lengths. They are not medical rules. A person’s progress should set the length, and a good program will review it as treatment goes on.
When a program offers one fixed length for everyone, ask how it decides who needs more or less time. Ask what happens if your loved one isn’t ready to leave when the time is up, and what happens if insurance stops paying before then.
Most people move through more than one level
Treatment often works in steps. Someone may start in detox, move to residential treatment, step down to partial hospitalization (PHP), then an intensive outpatient program (IOP) and finally outpatient care. Each step gives a little more freedom and a little less structure. So the time at one level is only part of the picture.
Not everyone needs every step. Many people start in outpatient care and do well. Our level of care guide walks through how that decision gets made.
Medication can be long term
If your loved one uses opioids, medication-assisted treatment may continue for months or years. Staying on medication is part of the treatment plan, and any change to it should be made with the prescriber.
This page is general information, not medical advice. Please talk with a doctor before making any change to medications or substance use.
What can make treatment shorter or longer
Often means more time
- Heavy use for a long time, or use of more than one substance
- A mental health condition that needs treatment too
- A home that isn’t safe or stable
- Past attempts that ended early
Often allows less time at a high level
- Use caught early, with few health problems
- A calm, substance-free home
- Steady work, school or family routines
- Good follow-through with outpatient sessions
Plans sometimes approve a few days at a time and review as treatment goes on. Ask the plan how it reviews length of stay. Our insurance verification questions can help.
How to plan around the time
Ask for a range
When you call, ask what length is typical for someone like your loved one, and what would change that.
Plan for the step-down
Ask what comes after this level of care, and where it would happen. Care close to home makes this easier.
Sort out work and home
Look into leave early. Our guide to FMLA and job protection explains federal rules that may apply.
Questions about how long rehab takes
Is 30 days of rehab enough?
For some people it is a solid start, and for others it isn’t enough. What matters most is what happens next. A short stay followed by steady outpatient care and aftercare is very different from a short stay with no plan.
How long does detox last?
Usually several days to about a week, depending on the substance and the person’s health. A slow benzodiazepine taper can take longer under medical care. Read what happens in detox for the steps.
Can someone leave rehab early?
An adult in voluntary treatment can usually choose to leave. Ask how the program handles that, and talk through a backup plan with your loved one before admission. Court-ordered care under Florida law works differently. See whether you can force someone into rehab.
Can someone keep working during rehab?
Often, yes, in outpatient care or an evening IOP. Detox and residential care usually mean time off. Learn more in what to tell an employer.
How long until someone is in recovery?
There is no finish line. Recovery is ongoing, and support often needs to change over time. If there is a setback, our page on what to do after a relapse can help. You can find more rehab questions on our main answers page.