All modern research/studies tend to demonstrate that, beyond 40 hours, productivity does not rise, and, beyond 50 hours, it actually plunge, with quality dropping, employees driven to burn-out, etc.

But still, the stupid mantra from the Silicon Valley is "you have to work 80 hours to be successful"

Why are these CEO/CTO unable to comprehend studies and adopting a totally irrational position ?

https://www.inc.com/tom-popomaronis/science-says-you-shouldn... https://www.cnbc.com/2015/01/26/working-more-than-50-hours-m... https://cs.stanford.edu/people/eroberts/cs181/projects/crunc...