It all depends on what kind of EV you have. Top of the line Model S has 400 miles of range and add to that supercharging. You will be able to drive almost as quickly as with an ICE car - you loose like 20 minutes on 620 miles. The limiting factor then becomes the driver of the car - rest stops, food and so on.

Check out Teslabjorns data ; https://docs.google.com/spreadsheets/d/1V6ucyFGKWuSQzvI8lMzv...

He does 1000 km range tests on youtube amongst other things.