[Hydrogen Korea] Doosan’s hydrogen drone pushes the limits. “The use of hydrogen as the drone’s energy source has indeed pushed the limits of unmanned aviation vehicles. Drones powered by heavy lithium-ion battery can only fly half an hour, but Doosan’s DS30 can do so for two hours”
http://www.koreaherald.com/view.php?ud=20190923000788
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While not as good as the H2 drone, battery drones are well over 30 mins. Note, last year model.
[https://newatlas.com/impossible-aerospace-us-1-drone/56283/](https://newatlas.com/impossible-aerospace-us-1-drone/56283/)