Will a urine test for cocaine show positive 144 hours after cocaine usage?

after 72 hrs it is supposed to be out of your system, but if you used large amoutns like an ounce or more, i would give it a week, and 82 hrs, well that is kind of close, getting pretty exact. is ti 82 hrs since last line? i mean i would wait 3 fulls days from when you used, i dont go by the exact hour. good luck.