via Stroke Rounds: Long Work Hours, Stroke and CHD Risk Associated | Medpage Today.

“Working 55 hours or more a week was associated with significant 33% increase in stroke risk and a more modest 13% increase in risk of developing coronary heart disease, compared to working 35 to 40 hours weekly, in the analysis of published and previously unpublished prospective cohort studies from the U.S., Europe, and Australia.”

One could argue for causation given the strength of association identified by this study.  Common sense tells us that anyone working more than 60 hours a week is going to have considerably less time for other activities like exercise and time with family and friends.  Long hours working also can lead to neglect of one’s health.