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Some THC metabolites have an elimination half-life of 20 hours. However, some are stored in body fat and have an elimination half-life of 10 to 13 days. Most researchers agree that urine tests for marijuana can detect the drug in the body for up to 13 days. However, there is anecdotal evidence that the length of time that marijuana remains in the body is affected by how often the person smokes, how much he smokes and how long he has been smoking.
How Long Does Marijuana Stay in Your System. How long marijuana stays in your system depends on a variety of factors. How often you smoke, your rate of metabolism, and your general health and weight all have an effect on how long it takes before marijuana is out of your system. Varied Timeframe.