If you’re weighing whether to get help — for yourself or someone you love — one of the first questions is almost always the same: how long is this going to take? It’s a fair thing to ask. You have a job, a family, responsibilities, and the unknown can be scary enough to stall the decision entirely.
Here’s the honest answer: for most people, the acute phase of detox lasts somewhere between three and ten days, and a medically supervised detox often runs about a week. But “detox” isn’t one-size-fits-all. How long it takes depends on the substance, how long and how heavily it was used, your overall health, and whether you go through it safely with medical support. This guide breaks down realistic timelines by substance, explains what shapes them, and shows what comes next.
The short answer
Most people move through the acute, most intense stage of withdrawal in about 5 to 7 days, though it can be shorter or longer depending on the substance. At SoCal Detox, medical detox typically takes around 7 days depending on what you’re detoxing from, and many clients then step into roughly 30 days of residential treatment to build the skills and stability that make recovery last. Detox clears your body; the deeper work is what keeps you well afterward.
What “detox” actually is
Detoxification is simply the process of letting your body clear alcohol or drugs while withdrawal symptoms are managed safely. People tend to picture it as a single event, but it actually happens in stages — an acute phase when symptoms are strongest, and for some people a longer, milder tail of lingering symptoms afterward. Detox is the essential first step of recovery, not the whole of it.
Detox timelines by substance
Withdrawal follows a different clock for every substance. The table below shows general, well-documented ranges. Individual timelines vary based on the amount used, length of use, overall health, and whether more than one substance is involved.
| Substance | Symptoms start | Peak | Acute phase |
| Alcohol | 6–12 hours | 24–72 hours | About 5–7 days |
| Opioids (heroin, painkillers, fentanyl) | 8–24 hours | Days 2–3 | About 5–10 days |
| Benzodiazepines (Xanax, Valium, Ativan) | 1–4 days | Around 1–2 weeks | Weeks (usually tapered) |
| Stimulants (cocaine, meth) | Hours to a day | Days 1–3 (“crash”) | About 1–2 weeks |
Note: long-acting substances like methadone and fentanyl can start later and last longer than the ranges above. Post-acute symptoms may also linger — more on that below.
Alcohol
Alcohol withdrawal usually begins within 6–12 hours of the last drink and peaks around 24–72 hours, with most acute symptoms easing within about a week. Alcohol is one of the most dangerous substances to withdraw from: severe cases can involve seizures or delirium tremens (DTs), which can be life-threatening. This is not something to attempt alone.
Opioids
Opioid withdrawal (heroin, prescription painkillers, fentanyl) typically starts 8–24 hours after the last dose, peaks on days 2–3, and eases within 5–10 days. It’s rarely life-threatening, but it’s intensely uncomfortable and a common trigger for relapse — which is why medication-assisted treatment (MAT) like Sublocade or Vivitrol can make such a difference in getting through it and staying well afterward.
Benzodiazepines
Benzodiazepine withdrawal (Xanax, Valium, Ativan, Klonopin) can begin 1–4 days after the last dose and peak around the second week. Because stopping abruptly can cause seizures, benzos are usually withdrawn through a gradual, medically managed taper that may extend over several weeks. Like alcohol, this is a substance where medical supervision isn’t optional.
Stimulants
Stimulant withdrawal (cocaine, methamphetamine) looks different — it’s driven more by psychological symptoms than physical danger. After an initial “crash” of fatigue and low mood, cravings, depression, and sleep disruption typically ease over 1–2 weeks. Support during this window matters, because the emotional low is where many people are tempted to use again.
Why detox length varies so much
Two people using the same substance can have very different timelines. The biggest factors are:
- The substance itself — each one clears the body on its own schedule.
- How much and how long you used — heavier, longer use generally means a longer, more intense withdrawal.
- Polysubstance use — using more than one substance can complicate and extend detox.
- Physical and mental health — co-occurring medical or psychiatric conditions can lengthen the process.
- Age and metabolism — these influence how quickly your body processes substances.
- Whether it’s medically supervised — proper care keeps you safer and more comfortable, and helps you move through it rather than getting stuck.
What about symptoms that linger? (PAWS)
Some people experience post-acute withdrawal syndrome (PAWS) — milder symptoms like disrupted sleep, mood swings, low energy, and occasional cravings that can come and go for weeks or months, especially after long-term alcohol, opioid, or benzodiazepine use. PAWS isn’t part of acute detox and it isn’t dangerous; it’s managed through ongoing recovery support like therapy and aftercare, and it steadily improves with time.
Detox is the first step, not the finish line
Clearing your system is essential, but on its own it doesn’t address why the substance took hold. That’s why detox flows into continued care: residential treatment for structure and stability, therapies like Cognitive Behavioral Therapy to address triggers, MAT where it’s appropriate, and a solid aftercare plan to protect your progress. Detox opens the door; the work that follows is what keeps it open.
Why a medically supervised detox matters
It can be tempting to try to “tough it out” at home, but for several substances that’s genuinely risky. Alcohol and benzodiazepine withdrawal can cause seizures and other serious complications, and going back to using after even a short break raises overdose risk because your tolerance drops. A medically supervised detox provides 24/7 monitoring, medications to ease symptoms, and a safe, stable environment — so you can focus on getting through it instead of white-knuckling alone. For complex situations, specialized detox services address higher-risk cases such as polysubstance use or pregnancy.
So how long will MY detox take?
The most accurate answer comes from a real assessment. A clinician can look at your specific substances, history, and health and give you a timeline you can actually plan around — plus tell you what level of care fits. You can verify your insurance benefits in a few minutes, and free, confidential national resources like the SAMHSA National Helpline (1-800-662-HELP) and FindTreatment.gov can help you understand your options. If you’re in crisis or having thoughts of self-harm, call or text 988 to reach the 988 Suicide & Crisis Lifeline any time.
Take the first step with SoCal Detox
If you’re in Southern California, you don’t have to figure out the timeline alone. SoCal Detox is a holistic, Joint Commission–accredited drug and alcohol detox and residential treatment center in the coastal community of Laguna Beach, Orange County. Our team provides safe, personalized, compassionate care through detox and beyond — and we’ll give you a clear, honest picture of what your recovery could look like.
Ready to talk it through? Contact us today or call our confidential 24/7 helpline at (888) 590-0777 to take the first step toward feeling like yourself again.
FAQs (Frequently Asked Questions)
How long does detox take on average?
For most people, the acute phase of detox lasts about 3 to 10 days, and a medically supervised detox often runs around 5 to 7 days. The exact length depends on the substance, how long and how heavily it was used, and your overall health.
How long does alcohol detox take?
Alcohol withdrawal usually begins within 6 to 12 hours of the last drink, peaks around 24 to 72 hours, and eases within about 5 to 7 days. Because alcohol withdrawal can cause seizures or delirium tremens, it should always be done under medical supervision.
How long does opioid detox take?
Opioid withdrawal typically starts 8 to 24 hours after the last dose, peaks on days 2 to 3, and improves within 5 to 10 days. Long-acting opioids like methadone and fentanyl can take longer. Medication-assisted treatment can ease symptoms and reduce relapse risk.
How long does benzo detox take?
Benzodiazepine withdrawal can begin 1 to 4 days after the last dose and peak around the second week. Because stopping suddenly can be dangerous, benzos are usually withdrawn through a gradual, medically supervised taper that may last several weeks.
Can I speed up detox?
There’s no safe way to rush your body’s natural clearing process, and “detox” products don’t change the timeline. What professional detox does is make the process safer and far more comfortable, which helps you get through it and into the next stage of recovery.
Is detox the same as rehab?
No. Detox is the first step — safely clearing substances from your body and managing withdrawal. Rehab (residential or outpatient treatment) is the work that follows, addressing the underlying causes of addiction and building the skills to stay in recovery.
What happens after detox?
Most people step into continued care, such as residential treatment, individual and group therapy, medication-assisted treatment where appropriate, and an aftercare plan. This is where lasting recovery is built.
