Longer working hours, productivity: there is no correlation

People used to work around 70 hours per week in the 1800s. With 6 days a week that amounts to almost 12 hours per day. But as things improved the work hours began to decrease. Economics professor Robert Whaples, has prepared a detailed timeline of this evolution. The modern day workday was established by Henry Ford at Ford Motor Company in 1926 where people worked 8 hours a day, 5 days a week. Full Article.