Stays gone for a few weeks, keep in mid that the beard isn't growing consistently - some hairs may be a bit dormant at the time of the wax and pop up not long afterwards. :/
Waxing the beard is very painful, especially if your facial hair is thick and heavy. Also, you should expect some bleeding and swelling where the hair is pulled out, won't look too pretty at first! (Don't schedule a night out on town immediately afterwards!) Those issues dissipate with time, the beard will grow a bit finer and will be easier to rip out, however the regrowth becomes more uneven (meaning untaxed hairs will start to appear almost as soon as you've had a wax) and there is an increased likelihood of ingrown hairs and follicular infections. Also you will need to let it grow out for several days before you have it waxed otherwise the wax won't be effective.
My electrologist told me that waxing will distort the pathway to the follicle and make electrolysis more difficult. Personally, I found waxing a quick and cheap interim fix - but for permanence and effectiveness electrolysis does the trick.