How Long Does Nicotine Take To Be Completely Out Of The System?

I had quit smoking in December. Within the last 3 weeks I have smoked 3 packs of cigarettes, 1 menthol, 2 regular. I am 5 8 155-160lbs. I am interning at a hospital with hopes of being hired, they nicotine (cotinine) test by urine. Approx. what date will it take for me to receive a neg test? Also I am prescribed xanax, klonopin, and adderol.Will that affect that nicotine test in any way? I am not around second hand smoke and quit today.