Depends on the amount of alcohol consumed, You will be clean within 24 hours(at the most) of drinking.
Going For A Blood Test, How Long Does Alcohol Stay In System?
Going for a blood test how long does alcohol stay with you
If you drink 3 beers how long does it stay in your blood and urine
Alcohol is detectable in blood for up to 12 hours.
Each Beer is a year bro