I try to shoot 1-2 hours a week, and I burn through ammo. I will normally shoot a couple hundred rounds of WWB 9mm, fifty or so rounds of Winchester NATO 9mm (I try to save these for my Sub2k, but its in the shop now, and I still have 700 rounds, so I shoot it occasionally), and normally 50-100 reloaded rounds to compare. After that, 50 rounds of 9x18. Then I get into the .22... I dont even keep track, I just buy a few bricks every few weeks.
If I go with my dad, my grandpa, my brother, or cousin, I will go through more ammo because we will trade guns around. When I take my fiance, she usually sticks to the .22, but she will shoot three or four hundred rounds in a two hour session.
i don't really know cause my main shooter for fun is a 22. just know the wife is always sayin pick up the brass on the porch.. my 9mm an 223 are mostly to keep the feel an make sure every thing is doing what it is made to do.....