It would probably be more spectacular a test flight of 4 hours but i was very interested in performing this test because it is very near to real use of Hybrix.20. 4 or 4.5 hours are possible for demonstration test but operational flight time is around 3 hours with light payload to 2 hours for heavy payload.
Lately many customers are telling us about electric multi-rotors flying for 2 hours or hydrogen fuel cells with 4 hours of endurance. It would be interesting to see these multirotors with heavy payloads.
I hope you like it guys
Jose Luis Cortes