Will cocaine have left your urine after 3 days?

Its drug effect remains in effect only for a short time. 30 min to a couple of hours, depending on the amount taken. Large amounts will cause withdrawal symptoms that can last many hours after the high, but that is not technically the drug itself, rather a result of its breakdown.

The byproducts remaining after it is broken down also do not remain long compared to other some other drugs like marijuana. 1-3 days for most people, depending on the amount taken and metabolic factors. A drug test on Monday will usually not catch cocaine use early in the weekend (Friday night or Saturday morning).