| http://www.w3.org/ns/prov#value | - A: A persons height, weight, metabolism and the amount of the drug taken are all factors of how long heroin will stay in your system. (Like alcohol how it takes women less drinks to get drunk then it does men)Heroin can last on average as little as 48 hours for the lighter users and can last up to 5-7 days in heavy users.The biggest factor is how often you use and the amount you use the longer you
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