That's not quite the range of the Phantom 3 Professional, which managed 2,500 feet without issue, but it's better than the 1,000 feet I got with the Phantom 3 Standard in open space and the 400 feet it managed in suburbia.
Medical specialists with a public voice like Dr. Oz should absolutely be encouraging people who are sleepy to sleep more. However, arbitrarily applying eight hours to everyone is actually harming people who simply need less sleep, or those who actually need more than eight hours.
1. Guess how much sleep would be adequate-for most adults it would be 8 hours. 2. For a week (7 full days), set your alarm clock for the same time each day. 3. Go to bed at an hour that would let you get the number of hours you think you need. 4. Record when you go to bed and when you wake up. 5.