The other day my wife ran into the store for a little while and I waited outside in the car. I had the windows up and the ignition turned on with the AC running. The AC ran for maybe 15 minutes or so on battery before the ICE turned on and charged the battery to three bars when it turned off. The ICE cycled on and off a couple of times as I waited for my wife to come out of the store. I was very comfortable in the car while waiting for her and it got me thinking a Prius might make a good surveillance vehicle. How long can you sit with the ignition turned on and the AC running? Is that bad for the car? Just wondering, it sure beat roasting in a hot car.