Diesel has a specific energy of 48MJ/kg and weighs 0.832kg/L.
48MJ converts to 13.33kWh. My diesel tank will take 70L from nearly empty. I've never timed it, but it's definitely substantially quicker than 10 minutes to fill.
So I'm transferring about 776kWh in to my diesel tank in <10 mins.
70 * 0.832 * 13.33 = 776.33kWh
So it would take a 1MW charger three quarters of an hour to transfer the same amount of energy. <gasp>
Did I get any of that right?