If you listen to the war stories, a large number of other successful tech companies or products like Apple, Nvidia, Microsoft, the original iPhone, the original

If you listen to the war stories, a large number of other successful tech companies or products like Apple, Nvidia, Microsoft, the original iPhone, the original Blackberry, the post-iPhone Android, etc. would nove have been successes if everyone had strictly done their 9-5, Mo-Fr. Success often means racing to get to market with significant lead over your competitors who are also working on solving the same problems you are and are most likely not sticking to the 9-5, mo-fr schedule either. Which is why probably not many market successes came out of Europe where everyone works 40h tops, unless it's their own company/passion project. I was blown away by how many people in the original iPhone team claimed lost their marriages due to spending so much time grinding to iron out all the last minute issues and get the phone out the door on time. Jensen Huang said in the beginning their team was iterating to ship a new GPU design every 6 months with a tiny team. I bet everything I own they were not doing only 40h weeks back then. I'm not endorsing this practice, which is why I don't work in start-ups, but succes in this racket for early stage start-ups was often correlated with burning the midnight oil and it seems like a lot of people were willing to make the sacrifice for enough equity in their mission to "change the world" and "make it".