does anyone know how long weed stays in your system. serious answers, please. don't guess if you don't know?

There are variables. If you are over weight figure twice as long as THC stores in fat cells. Normally a once in a while user..say one joint on the weekend. if your active..average build and drink a lot of water probably only a few days to a week to be safe. Moderate smoker..2 to 3 joints a week. I would say two to three weeks to be safe. An every day smoker needs a full month to get clean.

There's no exact date it just depends on the person. THC is what gets you high when using weed, and that has been said to stay in your system anywhere from 3 to 90 days

usually about 30 days

Usually about a month . i.e. Smoke a bowl , month later it will still be detectable in your urine .