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Just used this to move car into garage that was parked outside. Key was in the house phone was in my pocket. This works great being too lazy to go into the house to get the key at the time.
The amount of time the car will run isn't limited. However, you have to 'start' the car within two minutes of activating keyless driving, or you have to reenter your MyTesla Password again.
That was a bad post... I saw it too. You have to start the car within 2 minutes as others have said. I have driven mine well over an hour started this way.