Can anyone elaborate?
- 10h/day at the office - 25 min commute each way - 8h/day of sleep - 1h/day for chore (shower, dinner, breakfast)
That leaves you 4h/day to spend with your loved ones, plus weekends (unless “hardcore” also means working a little bit on Saturdays). And those 4h won’t be your best 4h. So anyone staying at Twitter will commit a suicide in terms of family and friends life.
Another option is that the previous stuff he worked on (Tesla, SpaceX, Paypal?) were game changers and had people wanting to work for them, and he thinks that Twitter is the same... But, my guess is it is not... people worked for twitter cause it was a good gig and paid well, but was not a game changer. If the culture changes overnight and now you have to work 20-50% more time with the same or less money and now less resources in house, screw that...