Hello.
In my school every activity lasts two hours. The problem is that there are teachers who teach more than one subject to the same students group, so FET can end making timetables where in one day a students group have the same teacher four hours straight, and that isn't advisable (neither for students nor for teachers).
I haven't seen any restriction about limiting the maximum hours per day a teacher can teach in a particular students group, so I suggest it. I think it could be very useful for others, too.
Thanks a lot for this wonderful piece of software.
The easiest variant is to solve this problem is with a min day constraint. So just include the other subject into a min day constraint.
An other variant is to tag the activities and use max tag per day constraint. But this is in fact much work too enter and i think it is also not very fast generating.