I hear it’s about a year.

From what I understand is that THC is stored in body fat. So the bigger you are the longer it stays. I’ve also heard that carbonated drinks hold it in longer. Generally six months from what I’ve heard. If you need to clean up, I would suggest that you drink lots of water. You should have to urinate so much that it is annoying. I hear that the supplement Niacin will help clean you out. For desperate measures water purification tablets will give a clean test, but be prepared to feel like you’ve been punched in the kidneys. This is all what I have heard. I don’t know if its fact or fiction. I do know I passed a drug test by drinking alot of water. I should have been dirty but they didn’t find anything. But that was back when I was young and dumb, They have probably updated testing procedures since then. Good luck if you have to test. Oh and it is spelled marijuana.