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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?
If you drink enough to raise your blood alcohol concentration to 0.015, it will take one hour for your body to eliminate the alcohol. Blood alcohol concentration can vary according to gender, weight, the amount of alcohol you drink, your activity level while drinking and the presence of food in your system. As a general estimate, alcohol may stay in your system from one hour to 12 hours.