I can’t advise on settings, having been treated with the YAG portion but my bikini was done after 3 treatments. Just before my third treatment there was less than 30% visible hair left. I’m sure my prior waxing contributed to these results because all the hairs at the initial treatment were in anagen. But even if not, 4 treatments should be enough if the settings are aggressive and treatments are 10-12 weeks apart.