The Monday through Sunday workweek usually lasts 8 working days, and the Monday through Saturday playweek typically lasts 4 working days. When you include in the possibility of public holidays, that overall quantity increases to 10 working days, and twelve-playing days.
The days themselves are just one element of the calendar, and there are plenty of others. Any seasonal modification is shown in the calendar, and it informs us when and where to go during certain times of the year.
Image source: free-printable-calendar.com