Δαφνη Ευτυχια Αρθουρος

"According to the Bureau of Labor Statistics, the average American works 8.8 hours every day. Yet a study of nearly 2,000 full-time office workers revealed that most people aren't working for most of the time they're at work.

[...]

"This is particularly good news for freelancers and others who work from home. It's easy to feel like you're not "doing" enough when you don't have to go into an office. Yet this research suggests that if you're productive for just three hours a day, you're outputting the same amount as someone in the office for eight hours."

-- Melanie Curtin (melaniebcurtin), "In an 8-Hour Day, the Average Worker Is Productive for This Many Hours", 2016-07-21, Inc. [bold emphasis added to make it clearer that this does not apply to every kind of job]