Work time regulations have the potential to have an important impact on work-life balance and wellbeing in medical education and graduate training. However, work-time is only one factor in a complex system.
The 2012 report by Morrow, Burford, Carter and Illing gives a good overview of the issues of trying to implement an initiative into a complex setting.
Morrow G, Burford B, Carter M, Illing J. The Impact of the Working Time Regulations on Medical Education and Training: Final Report on Primary Research. A Report for the General Medical Council: Centre for Medical Education Research, Durham University 2012 August, 2012.
One of the implications is that stressors like working hours have both an absolute effect but also have complex implications for identity and work-team unity that also have wellbeing implications.