3 hours of Raw....cause it worked so well for Nitro... I remember the 2nd week of Nitro when they switched to 3 hours, the show started with the nWo talking for 45 min!!!!! They then had a cruiserweight match that lasted aprox 8 mins and then the entire nWo came out again and cut another 20 min promo!!! and thats not all. In the entire 3 hour show there was only about 30 minutes of Wrestling and the nWo came out 3 more times throughout the show. Almost 2 hours of the entire show was dedicated to the nWo cutting promos in the ring. And back then they had a much larger roster then the WWE and they still couldn't book 3 hours of watchable tv and people on the roster still weren't getting tv time.
3 hours of Raw is fine in moderation, bet every week? Thats just too much. It also devalues your PPV's too. Part of what makes PPV's special is that they are longer events. If its the same length as your flagship show, who cares?