There is a thing called the THC calculator I found. It is a tough estimate. I think you will be fine. Are you short, tall skinny, junk in the trunk.lol all of that will depend on how fast your body gets rid of it. My post is somewhere around.. I just posted it. It's about drug testing. Anyway... it usually only takes a few days if you are totally clean before you smoke.

http://www.drugs-plaza.com/downloads/calc_thc.exe

Don't rely on it but it's cool to check out!