You can specify a global value in menu Timetable/Parameters:
If this value is set to 6 then your teachers cannot teach 1st,2,3,4,5,6,7. But they can teach 1,2, 4,5,6,7,8.
If you do not care about consecutive lessons and your teachers can teach or shall teach more lessons in a row, just disable this option.
You can also specify maximum lessons a teacher can teach consecutivelly for each teacher individually:
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