Your body clears roughly one standard drink of liquor per hour, but traces of alcohol can linger far longer depending on the type of test. A single shot of 80-proof liquor (1.5 ounces at 40% alcohol) takes about one hour to metabolize. Three shots take about three hours. The math is straightforward, but detection windows tell a more complicated story.
How Your Body Processes Liquor
The liver does nearly all the work of breaking down alcohol, and it operates at a fixed pace: about one standard drink per hour. Unlike most substances your body eliminates, where the rate speeds up when there’s more of it in your blood, alcohol is cleared at a constant, flat rate regardless of how much you drank. Your liver’s alcohol-processing enzymes are essentially maxed out after a single drink, so additional drinks just wait in line.
This means that if you have five shots of vodka over the course of an evening, your body needs roughly five hours from the last drink to fully metabolize all of it. Nothing speeds this up. Water, coffee, cold showers, and food can make you feel more alert, but they don’t change how fast your liver works. Time is the only thing that clears alcohol from your system.
Detection Windows by Test Type
How long liquor “stays in your system” depends entirely on what’s being measured. Each testing method has a different detection window because it’s looking for alcohol (or its byproducts) in different places.
- Breath: A breathalyzer can detect alcohol for up to 12 to 24 hours after your last drink, depending on how much you consumed.
- Blood: Alcohol shows up in a blood test for up to 12 hours after drinking.
- Urine (standard): A basic urine test detects alcohol for roughly 12 to 24 hours.
- Urine (EtG): A more sensitive urine test that looks for a specific alcohol byproduct can detect drinking for 48 hours after a few drinks, and up to 72 hours or longer after heavier drinking.
- Hair follicle: Hair tests can reveal alcohol use for 1 to 6 months after consumption.
The EtG urine test deserves special attention because it’s commonly used in court-ordered testing, workplace monitoring, and treatment programs. It doesn’t measure alcohol itself. Instead, it picks up a metabolic byproduct your body creates while processing alcohol, and that byproduct hangs around long after you feel sober.
What Affects How Fast You Clear Alcohol
The one-drink-per-hour rule is an average, and individual rates vary. Several factors shift the timeline in meaningful ways.
Body weight and composition matter because alcohol is water-soluble. People with more body water (typically those who are larger or have more muscle mass) dilute alcohol more effectively, resulting in a lower peak blood alcohol concentration from the same number of drinks. Women generally have a higher proportion of body fat and less body water than men of the same weight, which means the same amount of liquor produces a higher concentration in their blood.
Food in your stomach slows absorption into the bloodstream but doesn’t change your liver’s processing speed. Drinking on a full stomach means your blood alcohol level rises more gradually and peaks lower, but total clearance time stays roughly the same.
Liver health plays a surprisingly limited role for most people. Research comparing alcohol metabolism in healthy people versus patients with advanced liver cirrhosis found that only those with the most severe disease, specifically those showing jaundice, had a significantly slower clearance rate. Patients with serious cirrhosis but no jaundice metabolized alcohol at a normal pace. So unless your liver is in very advanced stages of failure, it’s likely clearing alcohol at the standard rate.
How Many Drinks Are Actually in Your Glass
One of the most common reasons people underestimate how long liquor stays in their system is that they undercount their drinks. The CDC defines one standard drink as 1.5 ounces of 80-proof (40% ABV) liquor. That’s a measured shot glass, not a generous pour.
A typical mixed drink at a bar often contains 1.5 to 2 ounces of liquor. A strong cocktail or a double pour can easily count as two or three standard drinks. If you’re pouring at home without measuring, a “drink” might be closer to two. Higher-proof spirits like barrel-strength bourbon (50 to 65% ABV) pack even more alcohol per ounce, meaning a standard pour contains more than one drink’s worth of alcohol.
To estimate your clearance time, count your actual standard drinks, not the number of glasses. Four generous mixed drinks could represent six or more standard drinks, meaning six-plus hours of processing time from when you stop drinking.
Blood Alcohol Timelines in Practice
A practical example helps illustrate the math. Say you weigh around 160 pounds and drink four shots of whiskey between 8 PM and 11 PM. Your blood alcohol concentration will peak sometime after your last drink, likely around 11:30 PM, and could be in the range of 0.08 to 0.10%. From that peak, your liver clears alcohol at a rate that drops your blood alcohol by roughly 0.015% per hour.
At that rate, you wouldn’t reach 0.00% until roughly 5 to 7 AM the next morning. This is why people sometimes fail a breathalyzer the morning after a night of drinking. You can feel perfectly fine, have slept several hours, and still have measurable alcohol in your system. If you drank heavily, you could blow over the legal limit well into the next day.
For anyone facing a urine screening that uses EtG testing, the timeline extends even further. Even after your blood alcohol hits zero, that metabolic marker remains detectable in urine for two to three days after moderate drinking.