I go anywhere from almost contact all the way out to 50 yards. I haven't shot at 100 yet, but I could see doing that. I eat a lot at a local mall and the spot I usually sit is roughly 50-65 yards from the doors. If a shooter walks in I'd like the confidence to be able to engage.
I also carry a full size 9mm so I have the ability to do so as well, but that's a whole other discussion.