The five-hour rule
Throughout Ben Franklin’s adult life, he consistently invested roughly an hour a day in deliberate learning. I call this Franklin’s five-hour rule: one hour a day on every weekday. Every time that Franklin took time out of his busy day to follow his five-hour rule and spend at least an hour learning, he accomplished less on that day. However, in the long run, it was arguably the best investment of his time he could have made.