As a point of reference, the HTC Droid Incredible didn't exactly have stellar battery life out of the box. In fact, most said it was "poor" at best.
Rooted on CM7 (gingerbread) and not using social apps, I used my phone "moderately" and could very, very easily go a day and a half or more... The amount of control you have once rooted is astonishing. I had an aftermarket kernel that was undervolted. The phone used almost zero battery at night while sleeping with wifi turned on...