I've got an odd question related to trying to find a camera to take a time-lapse movie from a location where there's no external power available. I've found an external timer that's battery powered (Pclix), but it's surprisingly hard to find a battery-powered camera that can last for more than a couple of hours on standby. I've read that DSLRs can last very long when turned on without a live preview, but I can't seem to find a hard number anywhere. So, for anybody who has a DSLR: If you have the camera on and ready to take a picture, but with everything else off (screen, autofocus, etc), how long can it sit in that state before draining the battery? 8 hours? 24? Longer? Alternately, if anyone has a better suggestion, I'd love to hear it.