Elon Musk Built Tesla and SpaceX While Working Over 100-Hour Weeks. He Says ‘Vacations Will Kill You’ and the Reasons Behind It Are as Chaotic as You’d Expect.

Elon Musk built SpaceX and helped turn Tesla Inc. into an electric-vehicle giant while repeatedly working more than 100 hours a week, a schedule he has linked to vacations that went spectacularly wrong. Musk Builds Companies Through Relentless Workweeks After…