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According to research, for an ounce of alcohol, it will take the liver one-hour to metabolized. For normal people, one ounce of alcohol will produce a .015 blood-alcohol concentration. So the time alcohol stays in your system will be directly proportional to the amount of alcohol you take. How Long Does Alcohol Stay in Your Urine?
However, 20 drinks is a negligible amount of alcohol in your system and even this amount of alcohol in your bloodstream is not detectable after 24 hours. Check out the BAC calculator above to calculate different drink combinations within a 24 hour period.i Tara. Alcohol only stays in the urine for about 24 hours, or one day after drinking. So a drug screen for alcohol based on urinalysis should not detect alcohol 48 hours after use.