Your liver clears alcohol at a steady rate of about one standard drink per hour. That means a single beer, glass of wine, or shot of liquor takes roughly 60 minutes to process, and there’s no way to speed that up. But “leaving your system” can mean different things depending on whether you’re asking about feeling sober, passing a blood test, or clearing a urine screening. The answer ranges from a few hours to several months.
How Your Body Breaks Down Alcohol
About 20% of the alcohol you drink gets absorbed directly through your stomach lining into your bloodstream. The rest moves into your small intestine, where it enters the blood even faster. From there, your liver does nearly all the work.
Your liver uses two enzymes to dismantle alcohol molecules in a two-step process. The first enzyme converts ethanol into a toxic, cancer-causing compound called acetaldehyde. The second enzyme quickly breaks acetaldehyde down into acetate, a much less harmful substance that your body eventually converts to water and carbon dioxide. This process happens at a fixed pace, regardless of how much coffee you drink, how much water you chug, or whether you take a cold shower. Time is the only thing that clears alcohol from your body.
How Long It Takes by Number of Drinks
Since the liver processes roughly one standard drink per hour, the math is straightforward. A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. That’s 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of distilled spirits.
- 1 drink: about 1 hour
- 3 drinks: about 3 hours
- 5 drinks: about 5 hours
- 8 drinks: about 8 hours
These are estimates for metabolizing the alcohol itself, not for returning to baseline in every way. Keep in mind that absorption takes time too. If you had your last drink at midnight, your blood alcohol level may still be rising for another 15 to 30 minutes before the countdown truly begins. Someone who has five drinks between 9 p.m. and midnight could still have measurable alcohol in their blood the next morning.
Detection Windows by Test Type
Different tests pick up alcohol or its byproducts for very different lengths of time. If you’re facing a test for work, legal reasons, or a treatment program, the type of test matters enormously.
Blood Tests
A blood alcohol test can detect alcohol for up to about 12 hours after your last drink. This is the most direct measurement of how much alcohol is currently circulating in your body.
Breath Tests
A breathalyzer can detect alcohol on your breath for up to 24 hours, though 12 hours is more typical for moderate drinking. The range depends on how much you drank and how quickly your body processed it.
Saliva Tests
Oral fluid swab tests can pick up alcohol for up to 24 hours after consumption. These are commonly used in workplace or roadside settings because they’re quick and noninvasive.
Urine Tests
Standard urine tests detect alcohol for a relatively short window, but specialized urine tests that look for a metabolite called EtG (a byproduct your body produces when processing alcohol) extend that window significantly. After a few drinks, EtG can show up in urine for up to 48 hours. After heavier drinking, it can remain detectable for 72 hours or longer.
Hair Tests
Hair follicle tests have the longest detection window by far. Alcohol metabolites become embedded in hair as it grows, and testing can reveal alcohol use from 1 to 6 months prior. Most practical results cover 3 to 6 months, since people regularly cut or trim their hair.
Why It Takes Longer for Some People
The “one drink per hour” rule is an average, and several factors shift it in either direction.
Body composition plays a major role. Alcohol dissolves in water, not fat, so it distributes through your lean body mass. Men generally have more total body water than women, which means the same number of drinks produces a lower concentration of alcohol in a man’s blood. Women, on the other hand, have proportionally larger livers relative to their lean body mass and actually clear alcohol faster per unit of body weight. Research in Gastroenterology found that women’s alcohol elimination rate per kilogram of lean mass was about 33% higher than men’s. But because women typically reach higher blood alcohol levels from the same amount of alcohol, the net effect is that it often takes women longer to return to zero.
Eating before or during drinking also matters. Food in your stomach slows the rate at which alcohol passes into your small intestine, which is where most absorption happens. Drinking on an empty stomach allows alcohol to move quickly into your bloodstream, producing a higher, faster peak. While food doesn’t change how fast your liver works, it spreads out the absorption, which can lower your peak blood alcohol level and affect how long you feel the effects.
Age, liver health, genetics, and medications can all influence the process too. People with liver damage or certain genetic variations in their alcohol-processing enzymes may metabolize alcohol noticeably slower or faster than average.
What “One Drink Per Hour” Means in Practice
This rate has practical consequences that catch people off guard. If you stop drinking at 1 a.m. after consuming six drinks over the evening, your body needs roughly six more hours to fully eliminate the alcohol. That puts you at around 7 a.m., which means you could still have alcohol in your system during a morning commute. Even if you feel fine, your blood alcohol concentration may not be at zero.
It also means that drinking faster than one drink per hour causes alcohol to accumulate in your blood, since your liver can’t keep up. Two drinks in an hour leaves one drink’s worth of alcohol waiting in line. Three drinks in an hour leaves two. This backlog is why binge drinking produces such high blood alcohol levels and extends the total time needed to clear everything.
For someone concerned about a specific test, the safest approach is simple arithmetic: count your drinks, note when you stopped, and allow at least one hour per drink from that point. For urine EtG testing, the math is less forgiving, since those metabolites linger well after the alcohol itself is gone.