How long does it take to pass a drug screen for marijuana?

Depends on the test. If it's a urine test, about a week should do it. Bodies work differently; it takes slightly longer for some, slightly less time for others. A Week is the outside limit, to be safe. If it's a snip of Hair, Good Luck. That joint you smoked last night will hit the end of your hair so you can cut it off in a couple of years.