Here's the REAL answer(s).

If the key is off, all your power for accessories ( radio, windows, powerpoints, etc. )
comes from the 12v under hood battery.

If the key is ON, all your power for accessories ( incl. 110 AC now ) comes from the HV battery pack first, until drained, then, the power reverts to the 12v under hood battery.

The HV battery can give you about 400 watt hours on a full charge before cutting out. ( It will cut out and leave enough in reserve to start the car )

12v Under-hood batteries vary, but assume it can give you 300 watt hours.

So with both, you can use up to 700 watt-hours and 'should' still be able to start without a jump. ( Under 'ideal' conditions. What if you park with a partially charged battery? Then you get far less. )

I have a 12v small fridge ( 6-pak size ) that draws 4A so about 50 watts.
In theory, this should run for 12 hours, but in my non-hybrid car, I needed a jump-start after I left it on for 6 hours.

If you run the gas engine for 5-10 minutes each hour, you could go on for days... just a thought!