Gawd you're wiki with these answers :)
Well its in your body for over 100 hours after you stop taking it... The half life is 36-37 hours that is the amount of time it takes for your body to metabolize half of what you took last.. Then half of that amount in another 36-37 hours ect..
Why do you want to know??
Wikipedia says the half-life is 20-73 hours. That means half the dose could still be there in 3 days..geez..didn't know it was that slow to metabolize. Anyway, FLaddict will probaly have the best answer for ya..By the way..Wiki is Hawaiian for "quick". Found that out on my honeymoon..not that I was "wiki" :)