Marijuana out of my system...?

Now I know there is no real way to answer this but im just curious if anyone has any idea. Im almost 18, 135 pounds(skinny as hell i know.) 6 foot, very athletic. I have been smoking steadily for a good 2 years and was just told I have to quit for 35 days and i'm being tested. How many weeks or even days do think it will take to get out of my urine. I know it's pathetic I can't quit but it's something I enjoy. Im in team sports in school so im constantly running and what not. My body fat percentage is like 5.8 % (I have a fancy scale.) Thanks!