The thing is, Musk claims to work that hard himself (or more), but the difference is that he is a direct beneficiary and earns millions per hour. Whereas a regular employee earns X amount per month, that's it. Maybe some scraps in stock market value, but one of Musk's tweets has more of an impact on those than a career of 80 hour work weeks would of any employee.

Also, one might be forgiven for doubting him on that; unless he's counting 'painfully stupid tweets' as 'work', the sheer volume of them would call the _possibility_ of this into question.

I think you wouldn't be forgiven if you don't cast doubt.

The guy runs 6 independent companies (at least their stock is!). There aren't 6*80 hours in a week.

Don't need to, he literally demands that in his tweet.