Quite a few.  For example, I used hair groups pointing to the right, left, up and out for both the pubic and belly button region.  Pretty much any part where hair naturally crisscrosses meant I had to use multiple groups.  Plus in some areas I had to use overlapping groups of varying densities to get a smooth fade out such as going from her shin (with lots of hair) to her upper thigh (where it eventually disappears).  I also used a few for her bangs, but that is pretty normal these days.