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I care for students as much as for teachers. Therefore I had devised the following trick. I have added to each activity a key which can be either heavy or light (actually I use § for heavy and ~ for light). Then I have added three constrains. The first one, for example, is:
Tutti gli studenti per attività con chiave devono rispettare il numero massimo di ore al giorno
Peso (percentuale)=100%
Chiave dell'attività=§
Max ore al giorno=5
and so on...
In most cases students have an optimal distribution of both kinds of activities during the week.
I really like the results and don't want to renounce to what I got.
 
When changing mode, these constrains have been removed immediately.

All considered, I still prefer the solution of limiting gaps to 1 hour per day, only for those teachers who refuse two non consecutive gaps. This can already be done.

Thanks a lot for the prompt help. It seems, however, that none of your suggestion is satisfactory. I have tried to change mode and, suddenly, all the constrains with a key have been removed. This is even worse that having two gaps.
I don't want to force any activity to fall in a certain slot. It just happens. I can't predict which teacher will get both the first and the last slot and which day o the week, therefore I don't know how to apply your other suggestions.
I really value your help, it adds to an already wonderful program. Nonetheless I suggest you, maybe next year, to add the new constrain "all gaps in the same day must be consecutive".

Hello, I am preparing the timetable for the next school year. We need each teacher to cover many first hours and many last (=sixth) hour. As a consequence, almost every teacher has a day with both the first and the last hour. Some teachers don't want more than four lessons in that day. FET accomplishes this nicely most of the times. For example: lessons from 8 to 10, a two-hours gap, then lessons again from 12 to 14. This is good. Lessons from 8 to 11 and from 13 to 14 is just as good.
In very few cases, however, FET can insert separated gaps in the same day. For example, lesson from 8 to 10, gap, lesson from 11 to 12, another gap, lesson from 13 to 14. This is very very bad. I would like to see a new option (for all teachers): gaps are consecutive if they fell on the same day. I am new to FET, maybe you have already discussed this idea but I haven't found it on the forum.