Since 1980 debates about the regulation of working time have been characterized by demands for flexibility and deregulation. This article looks at how the regulation of the normal working day has changed during the last 30 years and examines how these regulative changes interplay with new work practices. Based on theories on institutional change the article compares the development in working time regulations in the banking sector in three countries, Norway, Ireland and Sweden. Although the majority of the regulations remain intact, they have become considerably more flexible in all three countries. The normal working day is most weakened in Ireland, but it is also undermined in the two Nordic countries. New rules, practices and ideas result in more unsocial hours working, which increasingly remains uncompensated. These similarities across the countries are uncovered because of a research design that allows for examination of institutional change at a detailed level over a long period of time.