How long does methamphetamine stay in you system? please explain

Typically : Typically methamphetamine would show up in a urine drug test for up to 4 days.

48-72 hours: For the metabolites to be cleared in urine. Methamphetamine itself lasts for about 12-16 hours in the bloodstream and brain of most people, but the metabolites take longer to clear the body in terms of drug testing, which is usually what people are asking about. If you are a user, it is slowly destroying your body and mind if you use it regularly, and casual users become regular users. Get help.