The most likely cultural trait responsible for the difference in workweek length between the U.S. and the Netherlands in 2020 is:
The U.S. culture prioritizes capitalism, while the Netherlands’ culture prioritizes health and welfare.
This response highlights the differing values and priorities between the two cultures, with the U.S. focusing more on work and economic productivity, while the Netherlands places a higher emphasis on work-life balance and the well-being of its citizens.