If you are 170 pounds how long will it take cocaine to leave your body?

Between 72 and 96 hours 3-4 days for your body to fully process the harsh chemicals in cocaine. It normally takes just a couple of days, but, if you are a frequent user it could take 30 days or more. Hmmm....I get a UA once a month,and I had done coke 2 weeks before my UA and failed it.I thought FOR SURE it would be out of my system in a few days...I weigh 152,btw.