If you work more than 40 hours every week, shortening your workweek might be a good idea. A major new study shows that employees still at their desks into the evening run an increased risk of stroke, and the longer the hours they put in, the higher the risk. More than half a million people from all over the world participated in the study, they told researchers how many hours they worked per week. Then they were tracked for several years. The results showed that the people working a 55-hour week face 33% increased risk of stroke compared to those working a 35- to 40-hour week. The researchers think that long working hours often go together with things like stress, a lack of physical activity and alcohol consumption.