I would personally go every four weeks, assuming you achieve complete clearance each time. My first clearance took about 5 hours, spread over two weeks, and now I go back once a month for about an hour (spending less time now, though there was a fair amount of additional growth at the first followup appointment and two hours was needed.) The important thing is to start as soon as you possibly can, since you really need a year to be sure you get ALL the follicles and growth cycles. I very strongly urge you to stick to electrolysis for this crucial area.
Hope this helps!