....and a passenger is in the car waiting...what will happen. I have somewhat tested this...i know the car beeps because it misses me as i walk away, but this has only been for a few seconds, what happens if its longer.....
Turbogizzmo, The car will keep running until it runs out of gas/petrol. Along the way it will run the HV battery down into the dreaded pink/purple zone, then start the ICE to refill the HV, ICE shuts down, cycle repeats ad no-gasium. Leaving the car running for short errands is one of the "Hypermilers'" tricks to get super high MPGs. By doing so you don't go through repeated progressions through all the low MPG, four Holy Stages of Prius Warmup as the CPU remains at the highest stage attained. OMG, you may have to do some searches to decode the above. Digging into the past postings on PriusChat is most interesting and educational. Courage, mes enfants!
Translating and summarizing: the car will keep running until someone presses the POWER shut to shut it off, or until it runs out of gas. Yes, the passenger can drive it away without the fob.
Or a carjacker seeking to maximize his mpgs. arty: But, if the carjacker shuts it off, he's done. No restart without the fob.