>> It may be out of ignorance, but I'm not aware of any famous researcher who accredits their success to an 80 hour work week.

One of the greatest mathematicians ever, Paul Erdős, absolutely did - to the point of using methamphetamines to work harder, longer, and sharper.

https://en.wikipedia.org/wiki/Paul_Erd%C5%91s

Greatness is rarely healthy.