With titans kernel25 and ideal settings I'm getting 3 days without charging the battery. As you can see I charged the phone on saturday, 17. April. Now, Monday, 19. April the battery is in red level. I set the maximum CPU frequency to 850 Mhz.

On this screenshot you can see the flat line of the battery level during no/light usage of the N900.

In this three days are, 2 hours browsing, 30 min phone calls, 4 SMS, 2 e-Mails, wifi is always on, 4 hours of playing around with the settings (set new wallpapers...)