In my experience if people work 80% of the hours, they're at least 95% productive, because often on Fridays people don't start new things, or generally faff abo

In my experience if people work 80% of the hours, they're at least 95% productive, because often on Fridays people don't start new things, or generally faff about, or are tired. Having an extra day off a week to recharge can work wonders for creativity, productivity, lower stress levels, finding solutions to awkward problems. I wonder if actually 80% hours leads to more output than the original 100% for a lot of people.