In practice, 4 hours of endurance give you around 2.5 to 3 hours of actual flight. You must plan for an alternate and with Reserve fuel. And you might not get a

In practice, 4 hours of endurance give you around 2.5 to 3 hours of actual flight. You must plan for an alternate and with Reserve fuel. And you might not get all the clearances you expect. Charging will take in any case much longer than refueling.