I think "charging time" is the wrong metric to think about. The relevant metric is "miles/h". The model 3 may have a giant battery pack that takes forever to ch

I think "charging time" is the wrong metric to think about. The relevant metric is "miles/h". The model 3 may have a giant battery pack that takes forever to charge fully, but it's also very efficient so whatever electricity you get into it corresponds to more miles. All that matters for the situation to be sustainable is that you drive less than the amount of miles that you can charge while not driving, on average. That's a simple comparison between miles driven, the current you can charge at, and the number of hours you can charge per day.