That is a great question!!! This completely intrigues me and I would have to say that I have had anywhere from 1-20 (20 max) before, and it seems to come and go in waves. I probably currently average 5-10 (some times less), but would love to get 25-50 comments...if we're being honest.
I think I get about 5-20 comments depending on the subject (my highest ever was 43, which was quite exciting) I don't think I could handle having to read 43 on a daily basis, although i love the support. (I would feel guilty as I like to read the blogs of all my commentors. LOL)
So, I would say I am pretty happy with my number, although i would love to have a typical number...ok, and i am rambling...LOL