How to create a timetable for more than 5 days?

In menu "School - Number of days" it is possible to set the timetable to be for more days than just 5 days (e.g 10 days).

Note:
Please, keep in mind, that this "number of days" is considered as the "one whole week" for the software. So - in the case of 10 days you have to double the teachers lessons. For example if teacher is teaching 2 lessons per one standard week (usually 5 working days), then in 10 days timetable they will be teaching 4 lessons.