I used to just shave from the knees down in winter since I'd wear skirts regularly but never anything shorter.
Now that I'm swimming a couple of times a week, I shave the whole leg (well, both of them). I'm blessed with very light and slow growing hair, though, so I only have to shave once a week, if that often. I know women who shave daily and I just can't imagine giving up that amount of time to shaving.
Sarah