“The five-hour rule was coined by Michael Simmons, founder of Empact. The concept is wonderfully simple: No matter how busy successful people are, they always “set aside at least an hour a day (or five hours a week) over their entire career for activities that can be classified as deliberate practice or learning.”

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“The 5-Hour Rule Used by Bill Gates, Jack Ma and Elon Musk” by John Rampton. Entrepreneur. July 31, 2018 https://www.entrepreneur.com/article/317602