For most people, alcohol leaves the bloodstream at a rate of about one standard drink per hour. After a moderate night of drinking (four or five drinks), your blood alcohol level typically returns to zero within 5 to 9 hours, depending on your body weight and sex. But if you’re asking because of a drug test, the answer changes significantly: certain urine tests can detect traces of alcohol for up to 48 to 72 hours after your last drink.
How Fast Your Body Processes Alcohol
Your liver does the heavy lifting. It converts alcohol into a toxic intermediate compound, then quickly breaks that down into a harmless substance your body can use for energy. The average person with a body weight around 154 pounds (70 kg) can process roughly 7 grams of alcohol per hour, which works out to about one standard drink every 60 minutes. A standard drink means 12 ounces of beer, 4 to 5 ounces of wine, or 1 ounce of liquor.
Your blood alcohol concentration (BAC) drops by about 0.015 to 0.020 per hour. At the legal driving limit of 0.08, it would take roughly 4 to 5 hours to reach zero. This rate is mostly fixed. Your liver can only work so fast, and nothing you do, not drinking water, not eating a big meal, not exercising, will meaningfully speed up the process. Food and hydration can slow down how quickly alcohol enters your bloodstream in the first place, but once it’s there, your liver processes it at its own pace.
Realistic Timelines by Body Weight
The number of drinks and your body weight are the two biggest factors in how long it takes to hit a BAC of zero. Here’s what it looks like after five standard drinks, based on data from the University of Arizona:
Men (5 drinks):
- 140 lbs: about 8.5 hours
- 160 lbs: about 7.5 hours
- 180 lbs: about 6.5 hours
- 200 lbs: about 6 hours
- 240 lbs: about 5 hours
Women (5 drinks):
- 100 lbs: about 14.5 hours
- 120 lbs: about 12 hours
- 140 lbs: about 10.5 hours
- 160 lbs: about 9 hours
- 200 lbs: about 7 hours
Women generally take longer to clear the same amount of alcohol because they tend to have a higher body fat percentage and less total body water, which concentrates alcohol in the bloodstream. A 140-pound woman takes about two more hours than a 140-pound man to clear five drinks.
Why Some People Process Alcohol Slower
That “one drink per hour” average is just that: an average. Several factors push the number higher or lower.
Genetics play a major role. The enzymes your liver uses to break down alcohol come in different genetic variants. Some variants work faster, some slower. Certain populations, particularly people of East Asian descent, commonly carry a gene variant that causes the toxic intermediate compound to build up, leading to facial flushing, nausea, and a significantly different processing timeline. Other gene variants found more commonly in people of African descent can also speed up the first step of alcohol breakdown.
Body composition matters beyond just weight. More muscle and more water in your body means alcohol is diluted across a larger volume. Someone who is 180 pounds and muscular will generally clear alcohol faster than someone who is 180 pounds with a higher body fat percentage. Age also plays a role: older adults typically process alcohol more slowly, and liver function naturally declines over time. Anyone with existing liver damage, whether from heavy drinking, hepatitis, or another condition, will process alcohol less efficiently because the organ doing the work is compromised.
Blood, Breath, Urine, and Hair: Different Tests, Different Windows
The timeline changes dramatically depending on what type of test you’re facing. Alcohol itself clears your blood relatively quickly, but your body leaves behind metabolic byproducts that linger much longer.
Blood and breath tests detect active alcohol in your system. These align closely with the BAC timelines above. After your last drink, alcohol is typically undetectable in blood or breath within 12 to 24 hours, even after heavy drinking.
Standard urine tests also detect alcohol directly and have a similar window of roughly 12 to 24 hours.
EtG urine tests are different. They look for ethyl glucuronide, a byproduct your body creates when processing alcohol. This byproduct sticks around much longer than alcohol itself. The widely cited “80-hour detection window” is largely a myth for most drinkers. In practice, if you had a few drinks, EtG is typically detectable for up to 48 hours. Heavier drinking can push that window to 72 hours or slightly beyond. Hydration levels, your metabolism, and how much you drank all influence the exact cutoff. For most people, results fall below the standard cutoff level within 48 to 72 hours of the last drink.
Hair tests have the longest detection window by far: up to 90 days. These are less common but are used in some legal and employment situations.
What Happens in Your Body as Alcohol Clears
For casual drinkers, the process of clearing alcohol is straightforward. You might feel hungover, but your body returns to normal within a day. For heavy or long-term drinkers who stop abruptly, the timeline involves physical withdrawal symptoms that follow a predictable pattern.
Mild symptoms like headache, anxiety, and trouble sleeping typically appear within 6 to 12 hours after the last drink. These tend to peak between 24 and 72 hours, then gradually improve. For most people with mild to moderate dependence, the worst is over within three days.
Severe withdrawal is a different situation. Seizure risk is highest 24 to 48 hours after the last drink. A dangerous condition called delirium tremens, involving confusion, rapid heartbeat, and fever, can appear 48 to 72 hours after the last drink. This is a medical emergency and is most likely in people with a history of very heavy, prolonged drinking.
What Actually Helps (and What Doesn’t)
There is no way to flush alcohol out of your system faster. Coffee, cold showers, and “sweating it out” are all myths. Research has confirmed that beverages and foods that seem to lower blood alcohol levels do so by slowing absorption in the stomach and intestines or slightly increasing excretion through breath and urine. They do not increase your liver’s enzymatic processing speed.
The only thing that reliably clears alcohol from your body is time. If you need to be at zero BAC for a test, a medical procedure, or driving, count your drinks, use the timelines above based on your weight, and add a buffer. Many people underestimate how long alcohol stays in their system, especially after a night of heavy drinking. Ten drinks for a 160-pound man could mean 15 or more hours to reach zero. For a 120-pound woman, the same amount could take over 24 hours. That means alcohol from Saturday night drinking could still be measurable in your blood well into Sunday afternoon.