Your body eliminates alcohol at a fixed rate of about one standard drink per hour, and nothing speeds that up. If you had four drinks, you’re looking at roughly four hours before the alcohol is fully out of your system. The actual timeline depends on how much you drank, your body size, your biological sex, and your genetics.
The One-Drink-Per-Hour Rule
Your liver does nearly all the work of breaking down alcohol, and it operates on a strict schedule. It processes approximately one standard drink per hour, lowering your blood alcohol concentration (BAC) by about 0.015 per hour. That rate stays remarkably constant regardless of what you do. You can’t rush it with willpower, food, or tricks.
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 80-proof liquor. The key detail most people miss: a strong craft beer, a generous pour of wine, or a cocktail with multiple shots counts as more than one standard drink, which means your timeline is longer than you think.
Realistic Timelines by Number of Drinks
These estimates assume you stopped drinking and your BAC has peaked. Your liver starts the clock from your peak BAC, not from your last sip.
- 2 drinks: roughly 2 to 3 hours to reach zero BAC
- 4 drinks: roughly 4 to 5 hours
- 6 drinks: roughly 6 to 8 hours
- 8 drinks: roughly 8 to 11 hours
- 10+ drinks: 10 hours or more, potentially well into the next day
This is why people who drink heavily on a Friday night can still be over the legal driving limit on Saturday morning. If you finished your last drink at 1 a.m. after a night of heavy drinking, you could still have alcohol in your blood at noon. “Sleeping it off” helps you feel better, but your liver still processes alcohol at the same fixed pace whether you’re asleep or awake.
Why Some People Sober Up Faster
The one-drink-per-hour figure is an average. Several factors shift it in either direction.
Body size and composition. A larger person has more blood volume, so the same number of drinks produces a lower BAC to begin with. Someone who weighs 200 pounds will peak at a lower BAC than someone who weighs 130 pounds after the same three beers, giving their liver less work to do.
Biological sex. Women generally reach higher BAC levels than men after the same amount of alcohol, even at the same body weight. Women tend to have less body water and lower levels of the stomach enzyme that begins breaking down alcohol before it reaches the bloodstream. The result is more alcohol entering the blood, and a longer time to full sobriety.
Genetics. Your liver relies on a family of enzymes to break alcohol into less harmful compounds. Different genetic variants of these enzymes work at dramatically different speeds. One variant common in East Asian populations processes alcohol up to 90 times faster at the initial step, which is why alcohol causes facial flushing in many people of East Asian descent. Other variants found more commonly in people of African descent also change processing speed. These genetic differences are real and significant, not minor variations.
Food. Eating before or while drinking slows alcohol absorption, which lowers your peak BAC. It doesn’t change how fast your liver clears alcohol once it’s in your blood, but a lower peak means a shorter total timeline to zero.
Coffee, Cold Showers, and Other Myths
Coffee does not sober you up. A cold shower does not sober you up. Exercise, fresh air, drinking water, eating bread, vomiting: none of these change the rate at which your liver metabolizes alcohol. The Hazelden Betty Ford Foundation puts it plainly: the body rids itself of alcohol on a fixed schedule, and these interventions have no effect on BAC.
Caffeine can make you feel more alert, which creates a dangerous illusion. You may feel more awake, but your reaction time, judgment, and coordination remain impaired. This combination of feeling sober while still being intoxicated is one reason caffeine-alcohol mixtures are linked to riskier behavior.
How BAC Relates to Driving
The legal BAC limit for driving is 0.08 in every U.S. state except Utah, where it’s 0.05. But “legal” and “sober” are not the same thing. Impairment begins well below 0.08. At a BAC of 0.02, you already experience some loss of judgment and a slight decline in the ability to track moving objects.
Here’s a practical example. A 160-pound man who has three drinks in one hour will reach a BAC of roughly 0.07 to 0.08. Even though he’s near or at the legal limit right after finishing, it will take about two more hours for his BAC to drop to zero. If those three drinks were consumed over two hours instead, his peak BAC would be lower, and the total clearance time would be shorter, but he’d still need to wait.
The safest approach is straightforward math. Count your drinks honestly, note when you stopped, and allow at least one hour per standard drink from that point. If you had strong cocktails or large pours, add extra time.
How Long Alcohol Shows on Tests
Even after you feel completely normal, alcohol or its byproducts may still be detectable depending on the test. A standard blood alcohol test picks up alcohol for up to 12 hours after drinking. Other blood tests that measure breakdown products can show evidence of recent drinking for weeks. Urine tests using a marker called EtG can detect alcohol metabolites for 48 to 72 hours after your last drink. Hair tests can reveal alcohol use for up to 90 days.
For most people asking “how long until I’m sober,” the practical answer is the BAC timeline: roughly one hour per standard drink after you stop. But if you’re facing a test for work, probation, or a medical procedure, the detection window extends well beyond the point where you feel fine and your BAC reads zero.