That's only about 13% awake time. Right now I'm sitting at 46 hours uptime with 29 hours awake time.
Franky, everyone I've seen that touts 24+ hours of battery is hardly using their phone. Whenever they post their battery use screen, Android System is way down the list. Cell standby and Phone idle are usually the top 2 items.
I've just accepted the fact that if I use this phone as intended (web surfing, game playing, video watching, etc) then I am going to get about 8-10 hours of battery life. That's why I keep a charger at home, in the car and at the office. If I know I am going to be away from a charger for longer than that, then I just scale back my usage. I may get a spare battery but I am hesitating because I don't carry any sort of bag and I won't carry a battery in my pocket.