How to create a timetable for more than 5 days?

In menu Options/Settings it is possible to set the timetable to be for more days than just 5 days(e.g 10 days):

Please note that in this case you have to double the teachers lessons. For example if teacher is teaching 2 lessons per week, then in 10 days timetable he is teaching 4 lessons in 10 days.

Check also:
Two week timetable