I tried it and here is the problem with this solution:
a ) I think it counts characters and not words. But I can deal with this (by increasing the number to say 1000).
b ) It checks the number of characters of each post (question OR answer OR even a small comment). What I want is to check the content size of the entire THREAD, ie question + answers + comments on one page.
Maybe if there was a way to combine the records with same parentid and count their total content with the content of the record with the same postid?