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 a significant cultural distinction between the two countries, with the U.S. focusing more on work and productivity, while the Netherlands emphasizes work-life balance and welfare considerations, which contributes to the shorter average workweek.