The idea of a four-day workweek is really popular … On the heels of that research from Iceland showing that employees working a four-day workweek were happier and just as productive, a new YouGov poll found that 67% of American said they would prefer a four-day workweek with 10-hour days. Just 21% said they preferred a five-day workweek with 8-hour days. 12% said they didn’t know.