Even my little superzoom running on 4 AA batteries lasts forever. My camera is LCD in the back or in the viewfinder, so it is always sucking down the juice.
I went on a 6 hour car trip to Detroit and left it turned on the entire trip. I played around and snapped pictures the entire trip. I messed about once we arrived in Detriot. I went to a 3 hour (roughly) hockey game when we got there and left the camera on the entire game. I don't have a battery meter, it only tells me when it is almost done. I do have a discharge function if I use NiMH batteries, and I let it discharge for about 2 hours once at the motel room after downloading the pictures onto the laptop and the batteries were still good. I put them in the charger overnight for the following day.
I would think that as long as you are not using flash, my camera would eat battery power faster than a dSLR beings that my viewfinder is LCD and not optical such as on a dSLR.