Eh, I average 75 posts on a good week and it's not unusual to see me at 60 posts per week. And there are some people here who can do even more than 75 (I read in his services thread for example that @Ratimov can do over 100 posts a week).
See
Top posters on Bitcointalk in the past 7 days: only a few people post more than 100 posts per week. Then again, I can't know who uses multiple accounts.