It would probably be more spectacular a test flight of 4 hours but i was very interested in perform this test because it is very near to real use of the Hybrix20. 4 or 4.5 hours are possible for a demonstration test but real flight times will be near 3 hours with light payloads to 2 hours for weighty payloads.
Lately many customers talk us about electric multi-rotors getting 2 hours or hydrogen fuel cells getting 4 hours. It could be interesting to see this multirotors with weighty payloads.
I hope you like it
Jose Luis Cortes