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I have noticed at times,if I was generating the timetables and then decide to remove some constraints by first stopping,the time spent on regenerating increases.At times the time is longer than the previous one when the constraints were not removed.How do I solve this?

Okay

I have been having a very hard time when having constrain on
"a set of activities occupies min and max time slots from selection" for all teachers.I wish there can be a wholistic constrain like those on "max/min hours for all teachers" to ensure its not tiresome.Any help please?

A custom version would help me a lot.Would be grateful indeed

I have used the constrain on 'a set of activities occupies max/min slots from selection' and its amazing though tedious more so when you have putting all teachers and classes. Is it possible we have a general constrain for all teachers and students such that it will be easier to put constrains revolving around all teachers and students?If it can be there,it can really help alot

Kindoff thought since we have 9 hours daily apart from Tuesday where we have 10,6  would be minimum hours but I will reconsider that

It worked.Thanks
How did you know teacher 13 can't have a maximum of 6 hours daily and the teacher only have 21 sessions?

You have realised I haven't given teachers time not available meaning the speed should be good but its kind of slow

Have a look at it.That only have constraints for double sessions

OK.I have realized with addition of constraints for teacher handling sciences,the  generating is very slow to an extent of having 479 activities taking more than an hour.I may opt to be generating multiple timetables and then I select the best.I believe I can't miss a favourable one from the multiples

The doubles worked.Thanks
For the other,I didn't try since its quite tedious to do give the constraint to all teachers  on daily basis.Wish there was a way of having like max time slots from selection for all teachers.That would be better

For teachers taking sciences,they do have 2 hours consecutive for practicals.I have noticed there are likelihood of a teacher having those sessions for 4 days every morning which I don't think is OK.How can one make sure that those teachers will only have a maximum of 2 doubles a week?

How can one configure get to ensure teachers can never have 4 sessions consecutive with a break between (2-2) such that whenever a teacher taughts  2 sessions followed by a break,one can only have one more and not two.