How long does alcohol stay in your system?

Alcohol typically remains detectable in the body for several hours to several days, depending on the type of test used, how much was consumed, and individual metabolism. While the intoxicating effects wear off relatively quickly, alcohol byproducts can be detected long after drinking stops.

The body processes alcohol at a fairly steady rate, breaking it down primarily in the liver. Blood alcohol levels usually peak within one to two hours after drinking and then decline gradually. In blood or breath testing, alcohol itself is generally detectable for up to 12 to 24 hours after the last drink, though this window can be shorter or longer based on intake and testing sensitivity.

Urine testing often looks for alcohol metabolites rather than alcohol itself. Ethyl glucuronide (EtG) and ethyl sulfate (EtS) are byproducts that can be detected after alcohol has cleared the bloodstream. Depending on amount consumed and individual factors, these metabolites may be detectable in urine for one to three days, and in some cases longer after heavy drinking.

Hair and saliva tests have different detection windows. Saliva tests generally detect alcohol for up to 24 hours, while hair testing reflects patterns of use over weeks or months rather than recent consumption.

Detection time varies widely due to factors such as body size, sex, liver function, drinking pattern, hydration, and test type. Because of this variability, alcohol testing is discussed in terms of ranges rather than exact timelines, and results are influenced by both biology and testing method.