Ok I’ll admit I didn’t believe this, but it turns out it’s partially true [1]. Hours worked by wage group increases up to the 95% level, then drops again. So the bottom quintile works substantially fewer hours than the top quintile of earners, but the top 5% work fewer hours than the top 90-95%.

Edit: forgot link

[1] https://www.epi.org/publication/ib348-trends-us-work-hours-w...