It depends on how easy is to make batteries quick to swap. No need for ultra fast charging, they could just use a spare battery pack then the discharged one wou

It depends on how easy is to make batteries quick to swap. No need for ultra fast charging, they could just use a spare battery pack then the discharged one would go to the next plane after charging. If they find a way to say open a hatch and have the giant battery pack slide out to be replaced by a already fully recharged spare one, the stop could be as quick as changing horses to a carriage.