The Monday through Sunday workweek usually lasts 8 working days, and the Monday through Saturday playweek normally lasts 4 working days. When you include in the possibility of public holidays, that total quantity increases to 10 working days, and twelve-playing days.
The days themselves are simply one aspect of the calendar, and there are plenty of others. Any seasonal modification is shown in the calendar, and it tells us when and where to go throughout certain times of the year.
Image source: perleymargret.blogspot.com