Comment by pc86

In software development, sure (maybe). Most jobs aren't software development.

The vast majority of jobs your production slows as hours increase but there isn't a tipping point where you're less productive, even after accounting for errors or rework. There's a reason CPAs don't clock out at 37.5 hours during tax season, or warehouses or service desks or any number of things other than the specific thing most of us do often work more than 40 hours a week, especially when actively working to get a promotion.