Economists from Arizona State University, McMaster University (Ontario), and Goethe University (Frankfurt) released a study that found that the average U.S. employee works 19% more than the average worker in Europe. This statistic suggests that European workers put in approximately one hour less than U.S. workers each day. Interestingly, work trends vary by country, with Switzerland being the most comparable to the United States. The study does not explore whether or not U.S. workers are more productive, and could be skewed by the fact that promotions are more lucrative in the U.S., incentivizing workers to work longer hours to get ahead. Additionally, labor unions in Europe are stronger than in the United States, resulting in more worker protections.
See "Americans Work 25% More Than Europeans, Study Finds", Ben Steverman, Bloomberg, October 18, 2016