Q: I had to gain weight and I am fine now. It has been six weeks since I have had any canibus..How long before I check out clean on urine test. I have a physical for emplyment in two days and will have urine test.A: Cannibis sticks to sticks to fat, keep in mind. Don't drink too much water. Very clear urine will raise a flag to the testers.how long will this weed stay in my urine? Q: ok well i use to smoke weed, kinda frequently, but i stoped. i been clean for about 4-5 months ish? and i wanna smoke one last time before i completely quit.: I had to gain weight and I am fine now. It has been six weeks since I have had any canibus..How long before I check out clean on urine test. I have a physical for emplyment in two days and will have urine test. A: Cannibis sticks to sticks to fat, keep in mind.