From the links B2L posted, 3-4 days. Drink a lot of water to flush it out.
Please, please, please(!) post after you've gotten the results back and how long you abstained from nic. No one ever reports back!
Good luck!
We can not go take this thing for another 3-4 weeks so I will make sure and come back and let you know. I think they told us it would be weeks after that before we get the results back too. so this will take some time.