Only someone who's never worked at the executive level would write such tripe. I'm retired now, but during my time, 70, 80, or more hours a week was commonplace ... for which I received exactly zero additional compensation. Calls and emails were answered up to and sometimes past midnight and on weekends, and holidays, in restaurants and at sports events for truly urgent matters; and once, I had to leave my family alone halfway through a vacation in Europe, to fly back and address a company emergency.
As for Musk, during Tesla's early days, he brought a sleeping bag and slept on the factory floor, working essentially 24x7 to ensure a smooth startup. I realize there are those of you who consider it fulfilling to spend every spare moment of your lives playing Counterstrike and Grand Theft Auto, rather than something productive. Fine. But please, don't whine about how overworked you are because you occasionally may have to show your face behind a desk.