It’s about how you approach work, not how long you spend there.
Work-a-holics possess over work and even if they don't work long hours, they are still more likely to develop cardiovascular disease or diabetes than non-work-a-holics. By contrast, the research cited in this HBR article suggests that while those who work long hours not because they are possessed, but because they love what they do, are generally not at greater risk for serious health problems. The difference appears to be the ability to let it go and refresh. It the chronic rumination that is most toxic.