xanax, drug test, urine test, urine. If I took 3 zanax and haven't used them in 10 years but I weigh 260 lbs how long will it take to get out of my system for a urine test.i took a half of Xanax I think 1mg peach pill on oct 24. on nov 14 it showed on drug screen I haven't taken one in many years....