Your body eliminates alcohol at a fixed rate of about 0.015% blood alcohol concentration (BAC) per hour. That means if you’re at the U.S. legal driving limit of 0.08%, it will take roughly five and a half hours to reach 0.00%. There’s no way to speed this up. Coffee, cold showers, food, and exercise don’t change how fast your liver works through alcohol.
How Your Body Processes Alcohol
Your liver does nearly all the work of breaking down alcohol. It uses a two-step process: first, an enzyme converts alcohol into a toxic byproduct called acetaldehyde (a known carcinogen). Then a second enzyme quickly converts that into acetate, which your body breaks down into water and carbon dioxide for elimination. This chain of chemical reactions can only run so fast, which is why you can’t rush sobriety.
For most people, this process clears roughly one standard drink per hour. A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. That’s one 12-ounce beer, one 5-ounce glass of wine, or one 1.5-ounce shot of liquor. If you drink faster than one per hour, alcohol accumulates in your blood because your liver simply can’t keep pace.
Realistic Timelines by Drinking Level
Using the 0.015% per hour elimination rate, here’s what to expect for a person of average size:
- 2 to 3 drinks (BAC around 0.04–0.06%): approximately 3 to 4 hours to reach 0.00%
- 4 to 5 drinks (BAC around 0.08–0.10%): approximately 5 to 7 hours
- 6 to 8 drinks (BAC around 0.12–0.16%): approximately 8 to 11 hours
- 10 or more drinks (BAC around 0.20%+): 13 hours or more
These are estimates. Your actual BAC depends on how quickly you drank, your body size, and other individual factors covered below. The key point is that a night of heavy drinking can easily leave you with measurable alcohol in your system well into the next day.
Why It Takes Longer for Some People
Several biological factors change how quickly your body processes alcohol, sometimes significantly.
Body size and composition. A smaller person reaches a higher BAC from the same number of drinks. Body composition matters too: alcohol dissolves in water but not in fat, so someone with more body fat and less muscle will have a higher concentration of alcohol in their blood and take longer to clear it.
Biological sex. Women generally absorb more alcohol and take longer to process it than men, even when drinking the same amount. This is partly because women tend to have smaller body sizes, lower water content, and higher body fat percentages on average. The result is higher BAC levels that persist longer.
Age. Older adults metabolize alcohol more slowly. The same number of drinks that cleared in a few hours at age 25 may linger noticeably longer at 50 or 60.
Food. Drinking on an empty stomach lets alcohol enter your bloodstream faster, producing a higher peak BAC. Eating before or while drinking slows absorption, which lowers your peak level and can reduce total clearance time, though your liver still eliminates alcohol at the same hourly rate regardless.
Coffee and Other “Cures” Don’t Work
This is worth being blunt about: caffeine does not reduce the effects of alcohol on your body. The CDC is clear on this point. Drinking coffee after a night out may make you feel more alert, but your BAC stays exactly the same. You become a wide-awake person who is still impaired, not a sober one.
The same applies to cold showers, exercise, energy drinks, and “detox” supplements. None of these change your liver’s processing speed. The only thing that lowers your BAC is time.
You Can Still Be Over the Limit the Next Morning
One of the most practically important things to understand is that alcohol can still be detectable on your breath 12 to 24 hours after your last drink, depending on how much you consumed. A breathalyzer test the morning after heavy drinking can absolutely return a positive result.
Consider the math. If you stop drinking at midnight with a BAC of 0.16% (a level many people reach after 7 or 8 drinks over a few hours), you won’t hit 0.00% until roughly 10:40 the next morning. At 8 a.m., you’d still be around 0.04%, which is enough to impair reaction time and judgment even though it’s below the legal limit in most states. If your BAC was higher, or you had your last drink later, you could still be at or above 0.08% during a morning commute.
This catches people off guard regularly. Feeling “fine” after sleeping is not the same as being sober. Sleep doesn’t accelerate metabolism. It just makes the hours pass without you noticing.
How to Estimate Your Own Timeline
A rough method: count your drinks, estimate when you’ll stop, and assume your BAC will drop by about one drink’s worth per hour after that. If you have six drinks between 7 p.m. and midnight, your liver processed some alcohol along the way, but you likely still have a meaningful BAC at midnight. Give yourself at least one additional hour per drink beyond the time you stopped.
Online BAC calculators that ask for your weight, sex, number of drinks, and time frame can give a more personalized estimate. These are still approximations, not guarantees, because individual enzyme activity varies. But they’re far more reliable than guessing based on how you feel. Alcohol impairs your ability to judge your own impairment, which is one of its most dangerous effects.