About 3 days: The half-life of methamphetamine is variable with a mean value of between 5–12 hours. It takes approximately 6 half lives for a drug to be eliminated from your system. 12*6/24=3 days. The methamphetamine will stay in your system for about 3 days. Methamphetamine can also stay in your hair for up to 90 days.
Answered 8/1/2018
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