Five treatments, about one every 4 - 6 weeks. There is never zero regrowth, but it's almost nothing. It helps if you have dark hair and light skin for the laser to work the best.
exfoliate the area first, and use a GREAT shaving product - not like a foam, they have some great creams out there, but i'm pretty sure i can't say the name/link to that sort of site on the DIS...
take a nice hot shower, exfoliate, then use a new, sharp razor and only go over the area once. after you shower, find a nice moisturizer or oil (like the one above) for the area.