“…defined as more than 48 hours a week.” (p. 2)

Kodz, J., Davis, S., Lain, D., Sheppard, E., Rick, J., Strebler, M., Bates, P., Cummings, J., Meager, N., Anxo, D., Gineste, S., & Trinczek, R. (2003). Working long hours in the UK: A review of the research literature, analysis of survey data and cross-national organizational case studies (Employment Relations Research Series, No. 16), Executive Summary. London: Department of Trade & Industry.