I have much experience with women's legs. It's an easy job, but you have to be constant. On average, one leg (from knee to ankle) needs a 5 / 6 hours for the first clearance. If you wait long enough without shaving before the first clearance, the results are spectacular. The second clearance will need about 3 hours. And the third one, an hour and a half.
The skin of the legs is very hard and as James always says is a good area to do by yourself.
Do you want to see some examples of completed legs?
I can show you hundreds of them: