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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?
There are Several factors that determine this, such as the type of drug and the physical characteristics of the person taking it. But on average, alcohol will stay in your blood for 12 hours, marijuana for two days, cocaine for 24 hours, heroin for six hours, opium for 12 hours, and meth for one to three days.