It all depends on what and how much you took, your metabolism, how active you are, your overall health, etc. A quick, non-helpful answer is anywhere from 2 days to 3 weeks. If you took 5 mgs, one time, 13 days ago, there's probably no detectable amount still in your system. If you ate the last of a 15 capsule, 20-mgs-each refill yesterday…well, you get the idea. For more info on drugs & drug testing:

http://www.erowid.org/psychoactives/testing/testing.shtml or

http://www.erowid.org/psychoactives/psychoactives.shtml

and a link to hydrocodone, specifically:

http://www.erowid.org/.../...one_testing.shtml

Good luck on your whiz quiz.