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.
Smarter work affords us more time, but that saved time doesn't mean anything unless we put it to optimal use. Top CEOs have reported an average wakeup time of 6:15 a.m., with many rising before 5, and most worked at least two hours at home after dinner. In some cases, they regularly turned in 18-hour workdays.