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Feel free to add this to your list of reasons to work less hours throughout the year. Turns out there's a significant correlation between how much you work and premature death:
Longer working hours seem to lead to higher premature mortality. (For stats nerds: the strength of the relationship is significant, with an r-squared of 0.2). The implication that over-work is bad for you chimes with lots of research which links long working hours with poor health. Stress, for example, can contribute to range of problems like heart disease and depression.
But this is still not a perfect correlation as certain countries like South Korea have both long work hours and a low incidence of premature death (which could be attributed to their healthy diet).

For more on this, read the full article via The Economist