A medium-altitude long-endurance unmanned aerial vehicle flies at an altitude window of 10,000 to 30,000 feet (3,000–9,000 m) for extended durations of time, typically 24 to 48 hours.
A medium-altitude long-endurance unmanned aerial vehicle flies at a mid-to-high altitude for extended time frames, typically spanning 24 to 48 hours, within a height range of 3,000 to 9,000 meters (10,000 to 30,000 feet).