Ugh: Elon Musk endures a lot. Just ask him. In recent weeks, he has again expounded upon his long workdays and his infrequent vacations, all while mocking workers who prefer working from home as living in “la-la land.” Since his first startup almost 30 years ago, the billionaire entrepreneur has epitomized the hustle culture of Silicon Valley that is all about grinding out late nights at the office. His public discussion of pain and sacrifice has helped him create a demanding culture at the companies he runs, including the car company Tesla TSLA 3.11%increase; green up pointing triangle and the rocket maker SpaceX. Now, with the social-media platform Twitter, which he gained control of late last year, that approach is being tested anew as he races to remake the company and its remaining workforce, an effort that he has described as “quite painful.” His live-at-work ethos, through which his own suffering is put on display to motivate others, runs counter to the work-from-home ideal embraced by a new era of employees openly questioning one’s commitment to a job. Their “quiet quitting” while working has helped fuel a broader debate about how much one should give over to the daily grind. From Musk’s view, a lot. His approach raises questions about how best to motivate workers and get results. Is it giving them flexibility and focusing on work-life balance? Or is it trying to fire them up by working insanely hard and making clear they are expected to do the same? Musk, 51 years old, recently called working from home “morally…