This paper documents the emerging role of education in the well-known decline in US male working hours. An insignificant hours difference between high school and college graduates becomes a significant 2 hours/week advantage for college graduates within a generation. This growing "college hours premium" is confirmed in alternate data. Moreover, the growing premium exists throughout the distribution and is not generated by the tails. The increasing premium persists across a wide variety of robustness checks and presents as a widespread phenomenon. The emerging "college hours premium" increases the overall college earnings premium despite recent trends in the "college wage premium."