Your body eliminates alcohol at a fixed rate of about 0.015% BAC per hour, which works out to roughly one standard drink every 60 to 90 minutes. So if you stop drinking at a BAC of 0.08% (the legal limit in most U.S. states), it takes about five and a half hours to reach 0.00%. A heavier night of drinking that pushes your BAC to 0.15% or higher could take 10 hours or more to fully clear.
But “leaving your system” can mean different things depending on whether you’re talking about feeling sober, passing a breathalyzer, or clearing a urine test. Here’s what actually happens and how long each stage takes.
How Your Body Processes Alcohol
When you drink liquor, your liver does the heavy lifting. An enzyme breaks alcohol into a toxic intermediate compound called acetaldehyde (the substance responsible for many hangover symptoms). A second enzyme then converts acetaldehyde into acetate, which your body easily breaks down into water and carbon dioxide. This two-step process is largely what determines your timeline.
The catch is that your liver can only handle so much at once. No matter how much you’ve had, the elimination rate stays essentially constant at about 0.015% BAC per hour. That means drinking more doesn’t make your body work faster. It just extends the total time needed to process everything. A backup enzyme kicks in after heavy drinking to help, but it doesn’t dramatically speed things up.
Rough Timelines by Number of Drinks
One standard drink in the U.S. contains about 14 grams of pure alcohol. That’s 1.5 ounces of 80-proof liquor, 5 ounces of wine, or 12 ounces of regular beer. Using the 0.015% per hour elimination rate, here’s a general idea of how long it takes to return to a BAC of zero after your last drink:
- 1 to 2 drinks: roughly 2 to 3 hours
- 3 to 4 drinks: roughly 4 to 6 hours
- 5 to 6 drinks: roughly 7 to 10 hours
- 8 or more drinks: 12 hours or longer
These are ballpark figures for an average-sized adult. Your actual timeline depends on several personal factors.
What Makes You Process Alcohol Faster or Slower
Body weight and composition play a significant role. A larger person has more blood volume and body water to dilute alcohol, which means a lower peak BAC from the same number of drinks. A smaller person reaches a higher BAC faster and needs more time to clear it.
Biological sex matters too. Women generally absorb more alcohol and take longer to process it than men after drinking the same amount. This is partly because women tend to have a higher ratio of body fat to water, which concentrates alcohol in the bloodstream.
Food in your stomach slows absorption, which lowers your peak BAC. Drinking on an empty stomach means alcohol hits your bloodstream quickly and pushes your BAC higher, extending the total clearance time. Hydration levels and whether you’ve been drinking water alongside alcohol also play a role, though the effect is more modest than many people assume.
Detection Windows by Test Type
If you’re concerned about a specific type of alcohol test, the detection window varies considerably depending on the method:
- Blood test: up to 12 hours
- Breath test: 12 to 24 hours
- Standard urine test: 12 to 24 hours with moderate drinking, 72 hours or more after heavy drinking
- EtG urine test: up to 48 hours after a few drinks, and sometimes 72 hours or longer after heavier drinking
- Saliva test: up to 12 hours
- Hair follicle test: up to 90 days
The EtG test deserves special attention because it doesn’t look for alcohol itself. It detects a byproduct your body creates while breaking alcohol down, and that byproduct lingers in urine far longer than alcohol does. This is the test most commonly used in court-ordered monitoring, workplace programs, and treatment settings. Even moderate drinking can produce a positive result two full days later.
Why Coffee and Cold Showers Don’t Work
One of the most persistent myths about sobering up is that coffee, cold showers, exercise, or fresh air can speed the process along. None of these change your BAC. Caffeine may make you feel more alert, and a cold shower may make you feel more awake, but your liver is still clearing alcohol at the same fixed rate of 0.015% per hour regardless. The only thing that actually sobers you up is time.
Eating food after you’ve already been drinking doesn’t speed elimination either. Food slows absorption of alcohol that’s still in your stomach, but once alcohol is in your bloodstream, your liver processes it at its own pace. There is no shortcut.
A Practical Way to Estimate Your Timeline
If you want a rough personal estimate, start with how many standard drinks you’ve had and when you stopped. Assume each drink raises your BAC by about 0.02% to 0.03% (slightly more for smaller or lighter individuals, slightly less for larger ones). Then subtract 0.015% for each hour that’s passed since your last drink.
For example, if you had four shots of liquor over two hours and stopped at midnight, your peak BAC might be somewhere around 0.08% to 0.10%. At 0.015% per hour, you’d need roughly six to seven hours to reach zero, putting you at around 6 or 7 a.m. If you had a heavier night with seven or eight drinks, you could still have measurable alcohol in your system well into the next afternoon.
Keep in mind this is an estimate. Individual variation in enzyme activity, liver health, genetics, and other factors means your actual clearance time could be somewhat shorter or longer. When it matters, whether for driving, a test, or a medical procedure, building in extra time beyond your estimate is the safest approach.