The mental health of the Portuguese improves with the four-day work week. The preliminary study on the pilot project that tests the reduction of working time shows decreases in the levels of anxiety, insomnia and depression.

95% of the companies participating in the trial considered that the changes observed were positive. The reduction in the working week did not mean a decrease in salary, although it did mean an average decrease of 13.7% in working hours. Most companies chose to offer one day off per week.