Well, how tall are you? If your 200lbs and 5'5 and you don't work out much, you probably have extra fat for THC to store in. Its detectable up to about 2 weeks in urine after you stop smoking. I would give yourself at least that time just to be safe. But if your just talking about THC being detectable at all (like if you had a drug test today) then yeah, you would be doomed.