ON the Site Hair Drug Test????

How long does the process take??? I mean when you go get the test not the results. Ok, you go in the office and they just cut off some of your hair and you can leave right?? After that, you have the wait for the results and if the test comes back negative you start working right??

Also will Fluoxetine Prozac make you fail the test?? I was taking it for about 2 weeks on and off. Do i have to tell them up front about it?

Hurry i need answers....my test is at 2:00pm this evening:(