This doctor retired at 45 and then got ‘deeply depressed.’ What he finds wrong with FIRE.

Although Grumet estimates he now works 60 to 70 hours a week, “it doesn’t feel like that. I feel like I have tons of free time,” he said. “I don’t have days off and days on; I just have life.”

He’s quick to call his side hustles examples of “small p” purpose, rather than “Big P” purpose. The difference is a strong theme of the second book he just released, “The Purpose Code” (the first was “Taking Stock”).