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Wow thanks a lot for the quick and thorough answer

I checked my data and I have 31 different student sets with a total of 44 subjects for these student sets, so I would need to add 176 "activities occupy max time slots from selection" constraints. As the dialog box says "Please do not overuse this constraint" at the top, I don't think I'll do this

I will try adding Dummy students, 2-3 groups at first, then the full 44 if it works properly. Instead of using "Same starting time" constraints for S and DS Music (respectively), wouldn't directly adding a Dummy student group along with the real group in the Activity work?

Hi! Long time FET user (13 years) but it's the first time I'm stumped enough and cannot figure out a way to implement a constraint.

The school I'm generating a timetable with has 5 school hours (P1 to P5) for each day of the week (D1 to D5), so that's 25 hours a week. All students have 25 hours of courses, so no gaps in the schedule.

For certain subjects that are taught twice a week or more, I need to make sure that a subject is not taught on the last hour of a day and on the first hour of the next day. So for example, if students of group G1 have Music on P5 of D2, they should not have Music on P1 of D3, the earliest would be P3 of D3.

So what I'm trying to implement is some kind of "Min hours between activities". In the case above, I would add a constraint for two "Music" activities for a group G1 with a minimum of 3 hours between them. So:

• How could I manage to do this?
• Are the last hour of a day and the first hour of the next day considered "consecutive" in FET?

Thanks a lot!