writes "Overall working hours have fallen over the past century. But the rich have begun to work longer hours than the poor. In 1965 men with a college degree, who tend to be richer, had a bit more leisure time than men who had only completed high school. But by 2005 the college-educated had eight hours less of it a week than the high-school grads. Figures from the American Time Use Survey, released last year, show that Americans with a bachelor's degree or above work two hours more each day than those without a high-school diploma. Other research shows that the share of college-educated American men regularly working more than 50 hours a week rose from 24% in 1979 to 28% in 2006, but fell for high-school dropouts. The rich, it seems, are no longer the class of leisure. The reasons are complex but include rising income inequality but also the availability of more intellectually stimulating, well-remunerated work."
(And, as the article points out, "Increasing leisure time [among less educated workers] probably reflects a deterioration in their employment prospects as low-skill and manual jobs have withered.")