never thats why I asked. I am curious as well and trying to figure the balance as well. All that info was off of Tesla's support page as well.
Now, the thing with idle fees is you would have to really screw up to do it. All the way to 100% full takes a good hour because it is slow filling that last little bit. And, your phone is going to be notifying you over and over about how full you are getting.
Idle fees were put in place because people like me with free supercharging would just hook up and leave since there was no cost. But, that of course blocks the next person and is a jerk thing to do. Idle fees help stop that. I've never even come close to paying an idle fee.