How long can drones stay airborne?

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Tags

1. #called
2. #flight
3. #flying
4. #system
5. #startup
6. #impossible
7. #recharge
8. #times
9. #devices
10. #holds
11. #claims
12. #makers
13. #drone
14. #battery
15. #longer
16. #aerospace
17. #before
18. #almost
19. #hours
20. #other