that aside, if you're getting a drug test, they're probably testing for canibus (THC) in the system. i've heard that testing for every drug becomes expensive, so i wouldn't worry too much. give yourself a week, and then party like there's no tomorrow.
if you're in a SERIOUS bind, (i.e.- 5 rolls in one day, drugtest in 24 hours) then drink PLENTY of orange juice and water and it should flush it out.
Yeah it's about 3-5 days, different for everyone. My buddy took in about 4 pills on a Saturday and took a drug test on that following Wednesday and was fine. Hope this helps.