I checked, and the auto shut-off time on the ACC mode is 1 hour. See the second table on page BE-94 of the attached PDF file from the New Car Features Guide. By the way, in ACC the current drawn from the 12-V battery is ~5 A (plus whatever current the radio draws). In ON this doubles to ~10 A. It's a 48-Ah battery, and so you'd need 9 hours to run it flat at 5 A. A drive-in show should be fine.

Stan

 

Funny, the wife and I were thinking of going to the drive-in and we were wondering almost the same thing about draining the HV battery. But where we live, we need to run the A/C because of the heat, so I can't just leave the car in ACC mode. However, in ON mode, the ICE is going to shut down once the engine is warm, so the HV is going to be powering the A/C. I'm guessing the ICE will kick itself on whenever it is going to be needed. We'll see!!!

 

Thanks for all your help! We had a great time and the car did not give us any trouble.