Marijuana can stay in your urine up to a month..but with lots of water an cranberry juice and golden root pills or any other type or flush pill u can get it out in maybe about â¦ two weeks dependin on how much u smoked...i once got it out system in15days by flushin but I only smokd a half a joint.annabinoid metabolites appear in urine within two to fo â¦ ur hours after smoking marijuana and may persist up to 30 days (at the 50 ng/mL cut-off concentration) depending upon a person's previous pattern of abuse. In general, infrequent use of marijuana may only be detected for 1-3 days after use.