How Long Does Alcohol Stay in Your System
Your body clears it at a fixed rate of about one drink an hour, and nothing you try will speed it up.
Battling addiction & ready for help?
Your body clears alcohol at a fixed, steady rate, roughly one standard drink per hour, and there is nothing you can do to speed it up. Not coffee, not a cold shower, not water and a big meal. Only time lowers your blood alcohol, which is the single most important thing to understand about sobering up.
How long it stays detectable is a separate question, and the answer depends on what’s measuring it. Alcohol leaves your blood and breath within hours. A urine test looking for its breakdown products can flag it for up to a few days, and a hair test for far longer. The drink itself is long gone; the traces linger at different rates.
- Your body clears about one standard drink per hour, at a fixed rate, so four drinks take roughly four hours to leave.
- Nothing speeds it up. Coffee, a cold shower, food, and water do nothing; only time lowers your blood alcohol.
- Detection windows vary by test. Breath and blood read for hours, urine up to about 24 hours (3 days with an EtG test), hair up to 90 days.
How Your Body Processes Alcohol
The mechanism explains why the timeline is so stubborn. Almost all the work happens in one organ, at a pace it can’t be talked into rushing.
Where Alcohol Goes
Once you drink, alcohol is absorbed into your blood and distributed through your body’s water. The liver then breaks down the vast majority, around 90% or more, primarily through an enzyme called alcohol dehydrogenase that converts it to acetaldehyde and onward[1][2].
Only small amounts leave your body unchanged[2]:
- 0.7% through your breath — the fraction a breathalyzer reads.
- 0.3% in urine.
- 0.1% in sweat.
A Fixed Elimination Rate
Here’s the part that matters most. Alcohol clears at a near-constant rate rather than a percentage of what’s present, because the enzyme that processes it runs at close to full capacity. In a 70 kg adult, the liver’s maximum elimination is roughly 8.5 grams per hour[2]. That works out to about one standard drink an hour, and a blood alcohol drop of about 0.015% per hour.
Why Nothing Speeds It Up
Your liver is already maxed out, so you can’t make it go faster. Coffee makes you a more alert drunk, not a sober one. A cold shower, exercise, food after the fact, or chugging water do nothing to the rate.
The math is simple and unforgiving: four drinks means roughly four hours before you’re clear, no matter what you try.
How Long Alcohol Shows Up on Tests
Different tests catch alcohol over very different windows, which is why “how long does it stay” has more than one answer. A breath test and a hair test can disagree by nearly three months.
The Detection Windows
These are typical, approximate ranges. Individual results vary with how much you drank and your own metabolism.
| Test | Typical detection window |
|---|---|
| Breath | Hours, while alcohol is in your blood |
| Blood | Up to about 6-12 hours |
| Saliva | Up to about 12-24 hours |
| Urine (standard) | Up to about 12-24 hours |
| Urine (EtG marker) | Up to about 72 hours, sometimes longer |
| Hair | Up to about 90 days |
The EtG urine test is the outlier among the common ones. It looks for a metabolite that lingers after the alcohol itself is gone, which is why it can flag drinking from a couple of days earlier.
A breathalyzer works because alcohol literally evaporates out of your blood. A small, fixed fraction of it leaves through your lungs, at a remarkably consistent blood-to-breath ratio of about 2300 to 1[2]. That stable ratio is what lets a breath reading stand in for a blood alcohol level, no needle required.
What Changes How Fast You Clear Alcohol
The “one drink an hour” rule is an average. Several things shift it, driven by both biology and circumstance[3].
The Main Factors
What moves the clock for one person versus the next:
A heavy drinker may feel less drunk at a given level, but that’s tolerance, not faster elimination. Their blood alcohol still falls at the same fixed rate, and they’re just as impaired for legal and safety purposes. Feeling sober and being sober are not the same thing.
- Sex and body composition. Differences in body water and lean mass affect how alcohol distributes and concentrates.
- Liver size and health. A larger or healthier liver clears alcohol more efficiently; a damaged one, less so.
- Food. Eating slows absorption, lowering your peak level, though it doesn’t change the elimination rate itself.
- Genetics and ethnicity. Variations in the genes for alcohol-processing enzymes (ADH and ALDH) meaningfully change how fast people metabolize alcohol.
Tolerance Isn’t Faster Clearance
When Counting the Hours Is Worth a Second Look
Curiosity about timing is normal. The pattern behind the question sometimes isn’t.
Regularly tracking how long until you’re “clear” to drive, to pass a test, or to just function is worth noticing in yourself. Needing to manage drinking around obligations is a common early sign that it’s becoming hard to control.
Frequent heavy drinking also keeps your liver, the organ doing all this work, under constant strain. If any of that sounds familiar, knowing what to look for is a calm first step.
Spot the warning signs of a drinking problem →
If you drink heavily every day, stopping suddenly can be dangerous, which is exactly why the safest and easiest way to quit is a supervised detox, where medication takes the edge off withdrawal. The way out is gentler than the agony most people picture, and the life on the other side is better than they fear.
The next step doesn’t have to be a big one. If you drink heavily, talk to a doctor before stopping — withdrawal can be dangerous. For free, confidential help 24/7, call SAMHSA’s National Helpline at 1-800-662-4357, or our treatment centers directory can point you to the right level of care, from outpatient to medically supervised detox. Reaching out today is a real step forward.
Frequently asked questions
How long does alcohol stay in your system?
Your body clears alcohol at a fixed rate of about one standard drink per hour, with blood alcohol falling roughly 0.015% per hour[2]. So four drinks take roughly four hours to clear. How long it stays detectable depends on the test: hours for breath and blood, up to a day for standard urine, up to about three days for an EtG urine test, and up to 90 days for hair.
Can you speed up sobering up?
No. Because your liver processes alcohol at close to full capacity, the elimination rate is essentially fixed and nothing speeds it up[2]. Coffee, cold showers, exercise, food, and water don’t lower your blood alcohol; they just mask the feeling. Only time works. If you’ve had four drinks, plan on roughly four hours regardless of what you try.
How long does alcohol show up in a urine test?
A standard urine test typically detects alcohol for about 12 to 24 hours. An EtG test, which looks for a longer-lasting breakdown product rather than alcohol itself, can flag drinking for up to about 72 hours, sometimes longer. These are approximate windows that vary with how much you drank and your own metabolism[1].
Why does alcohol affect some people faster than others?
Clearance varies a lot from person to person. Sex and body composition affect how alcohol distributes, liver size and health affect how efficiently it’s processed, food slows absorption, and genetic variants in the alcohol-processing enzymes ADH and ALDH change metabolic speed[3]. These factors shift how fast you reach and clear a given blood alcohol level.
Does drinking water or coffee lower your blood alcohol?
No. The liver eliminates alcohol at a fixed rate it’s already running at, so neither water nor coffee changes how fast your blood alcohol falls[2]. Coffee can make someone feel more alert while still being impaired, which is actually dangerous because it masks how drunk they are. Time is the only thing that sobers you up.
Does high tolerance mean you clear alcohol faster?
No. Tolerance means a heavy drinker feels less impaired at a given blood alcohol level, but their body still eliminates alcohol at the same fixed rate[2]. They’re just as impaired for driving and legal purposes, and just as far from clear. Feeling sober and being sober are not the same thing.
Get Treatment Help
If you or someone you love is struggling with addiction, getting help is just a phone call away, or consider trying therapy online with BetterHelp.
Exclusive offer: 20% Off BetterHelp*Following links to the BetterHelp website may earn us a commission that helps us manage and maintain AddictionHelp.com. *Get 20% off your first month of BetterHelp. Offer valid for new BetterHelp users only. Offer cannot be combined with insurance.
- Fact-Checked
- Editor
