How long can you keep cocaine?

This answer is from the UK's BUPA Drug testing website.

COC - Cocaine derived from the leaves of the coca plant, is a potent central nervous system stimulant and a local anesthetic. Cocaine induces euphoria, confidence and a sense of increased energy in the user; these psychological effects are accompanied by increased heart rate, dilation of the pupils, fever, tremors and sweating. Cocaine is used by smoking, intravenous, intranasal (snorting) or oral administration, and produced in the urine primarily as benzoylecgonine in a short time. Benzoylecgonine has a longer biological half-life (5-8 hours) than cocaine (0.5-1.5 hours) and can generally be detected for 24-80 hours after cocaine use or exposure.

So to re-cap then ; Benzoylecgonine is what they actually test for in urine lab tests and not the drug Cocaine.According to the people who do the testing, this should be out of your system in 24-80 hours.
Hope this helps and keep your nose clean!!!!!!!