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

My insight:

I don't believe in the numbers when used in slogan-like statements-claims such as 7 secrets of life, 10 rules to become successful, 5 ways to have more friends, 10 tips to become fluent in any language because these numbers are only used as a hook to get possible readers interested in what is in front of them. Don't take, therefore, the five-hour rule below seriously because it certainly changes from one person to another. What matters is whether you spend time regularly on and put constant effort into learning something new.