Superchargers are not used to fully charge cars, because it's faster to stay lower in the battery -- supercharging is very slow for the last 20%. For this reaso

Superchargers are not used to fully charge cars, because it's faster to stay lower in the battery -- supercharging is very slow for the last 20%. For this reason, superchargers are placed closer together than the maximum range of the car. So no, supercharging does not take hours.