Meanwhile, a trend in the last year:

AI Startup Founders Tout a Winning Formula–No Booze, No Sleep, No Fun

https://news.ycombinator.com/item?id=45221423

996

https://news.ycombinator.com/item?id=45149049

New trend: extreme hours at AI startups

https://news.ycombinator.com/item?id=45156674

SV AI Startups Are Embracing China's Controversial '996' Work Schedule

https://news.ycombinator.com/item?id=44657480