Here is what instant reply for 2 years (here) has gotten me:
Shot at 2007-07-14
473 e-mails at which most contain the maximum 61 messages (or e-mails) per e-mail. It's confusing unless you use gmail. My average per e-mail is 49 (yes I was bored enough to figure it out). So that would be about 473*49 = 23,177 posts, I've been e-mailed about. Ahhh!
Talked about loving a subscription...