How long does leg hair have to be to be waxed?

Ive never done anything like that before, Im a shaver, but seeing as I never get to shower alone and trying to contort in the shower while supervising toddler intruders or finding time to shave outside the shower, I thought Id look into it.
I havent shaved in two days because Dh is away til next wednesday. Do you think thats long enough to grow the hair and have it waxed? Im already super *****ly and yesterday was the 'hair growing back and itching me' stage.

Im trying to be brave and get my bikini done at the same time but Im a bit of a chicken