Bill Gates, Warren Buffett, and Oprah all use the 5-hour rule. Here's how it works, and why it's powerful.

Spencer Platt/Getty Images Many leaders try and set aside at least an hour a day for things like deliberate practice or learning — what the author calls a "five-hour rule." These hours could be spent reading — Oprah credits much of her success to that, and leaders like Bill Gates and Warren Buffett are prolific readers. Others, like Jack Dorsey, set aside that time for reflecting and thinking. Visit Business Insider's homepage for more stories. In the article "Malcolm Gladwell got us wrong,"...