How long would the batteries last on a Prius or Tesla if every journey they made, both long and short, was at near max continuous power? Not long at all.
I'm not sure if a drone can do translational lift, especially the ducted fan variety. On the other hand, a teleporter can do translational lift quite well.
Then there's the dreaded vortex-ring-state - the nerds designing this thing should be very afraid of VRS and any attributions made by forum posters.