In all studies that I saw (and there is general lack of quality studies in that area - hard to set up realistic A/B experiment and observational data get you on

In all studies that I saw (and there is general lack of quality studies in that area - hard to set up realistic A/B experiment and observational data get you only so far) while average productivity dropped after 40h there were outliers (~10%) with no drop in productivity or increase in error rate with 60h/week. There is good chance that in elite job in Asia (and TSMC is definitely elite) almost everyone is in that category - can work very long hours without burning out. People who could not are either pushed out or leave on their own.