When I first joined, recently, I read a huge majority of the material here. I think you'll find, like I did, that a lot of it is repeated, and then there's a lot of leisure-type of talking, where it's not something you can get knowledge from. (like people joking and playing around with each other.) I'm not sure exactly how much I read, but it was at least 6-10 hours worth, and I'm a pretty fast reader.