Under time....teachers....a teacher/all teachers....max hours daily in an hourly interval for all teachers, i would suggest we have 'Start of day' virtually just like we have end of day.It will help while ensuring that for the first 4 sessions, a teacher can only have 3 sessions.With it,one can select it,and 2nd break for effective of the constraint when i need teachers never to have 4 sessions in a row even when there is a breaks.
Example....2 lessons,break, 2 lessons, 2nd break.
Interval is [a, b) like in mathematics, so a is included in the interval and b is not. Just select the 1st hour of the day as start and the 6th (? not sure, you know better) as end. Everything is possible to express in this notation.
Thanks for the feedback.Well understood