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Average time that marijuana is detectable in the urine based on frequency of use: One time only 4-10 days. 2-4 times per week 25-35 days. 5-6 times per week 35-50 days.
Some THC metabolites have a half-life of 20 hours, while others like THC-COOH have a half-life of 13 days, according to High Times. A 2014 study found that regular marijuana users have traces of marijuana in their urine for about two weeks, according to High Times.