Alcohol typically stays in your system for about 6 to 72 hours depending on the type of test used for detection and individual factors. Here's a general overview:

• In blood, alcohol can be detected for up to 12 hours.
• In breath, detectable for 12 to 24 hours.
• In urine, usually 12 to 24 hours, but up to 72 hours or more after heavy use.
• In saliva, up to 12 hours.
• In hair, alcohol can be detected for up to 90 days.

The half-life of alcohol in the body is about 4-5 hours, meaning it takes about 25 hours (around five half-lives) for your body to clear alcohol completely after one drink. The actual time depends on factors like genetics, age, weight, liver function, and how much and how fast alcohol was consumed. Typically, the body metabolizes alcohol at a rate of approximately one standard drink per hour, but this can vary per individual. Therefore, alcohol is usually out of most detection tests within 1 to 3 days, but hair tests can reveal alcohol use for up to 3 months.