Supposed to be 3-4 hours. I just finished setting up the wind turbines and I'm thoroughly underwhelmed. The only other R&C I've played is the Tools of Destruction demo and the PSP game and both were okay. I'm bought this to see what the hype is all about. I'm not very far at all so I'm sure it'll get better.
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3 
and Wii 
Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.
