It sounds like you don’t know what you are talking about. You can charge the Model S in about an hour, so I highly doubt that the Model 3 will take 52. Tesla also has stations where you can swap out the battery faster than you can fill a car with gas.
Swap out a $20K part? Sure hope you don't get a dying battery on the last swap!!! :)
I agree on the charging time.
But the battery swap deal is pretty much done.
http://fortune.com/2015/06/10/teslas-battery-swap-is-dead/