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Yes, it's true! I did it and now I'm reaching the target quite easily.
Thankss!!!🙏

By the way...since sometimes the software runs over nighttime or unattended anyhow, expecially when runs multiple timetables, it would be nice to have the option to turn-off PC when done.

Many thanks Liviu!
I suggested the counter of iteration not because is necessary but somehow is nice to see how much work this wonderful software is doing in our place and the human effort saved.
Coming back to my problem, I guess there are some bad constrains/mistakes not properly set, causing Fet not to find a valid solution.
I've attached below the link OneDrive to the file and I would really appreciate if you can give a look to it and provide me a feedback.
Again many thanks and my compliments for this wonderful and useful tool!

Sauro's time-table

Many thanks Liviu!
Actually this is the same method I implemented my own and it works.
I just wondered if this could somehow related with a very strange convergence issue I'm experiencing now.
I'm working on a timetable for a school with two buildings. I've introduced classes, teachers and activities for one building at the time and tested independently successfully.
Mostly of the teachers works in a building or in the other, while five of them are shared between the two buildings.
I properly set the classes in the rooms and the rooms in each building so Fet can evaluate to move teachers from one building to the other during the holes.
I've set constrains to allows holes for the trips between building (1 trip per day per teacher, max 5 trips per week).
So, everything seems ok in the constrains (they works properly one building at the time) but when I join the two buildings and related classes/teachers, Fet seems to loose the way...    
When it starts, immediately places 130 activities over 279 but after that it stops for a second, then the number of activities placed progressively come back to 100...80..50...30...16 in ten seconds!  
I can understand if stops at a certain number (too many / too bad constrains) but I really can't understand why it should step back to only 15-16 allocated activities. This seems really a non sense to me.
If I disable activities of one entire class (whichever is it over the 11 total classes) it works perfectly and find good combinations in few seconds.
Do you have any Ideas about it?
I've attached the link OneDrive to some screenshots of the app when running.

Screenshots of the issue

Thanks in advance!
(...by the way, it would be nice to have a counter showing the number of iterations done when running, just next to the lapsed time)
Sauro

Is there a simple method to se a constrain to limit the maximum number of hours a day per class of a specific course/teacher (either consecutive or not), preferably not involving keys?
Thanks

IT WORKS!     
I just made a donation with PayPal!
Many thanks for your prompt and kind support! I guess I could be back to you in the next few days with some questions...

Thanks so much Liviu!
I've to apologize but I'm really a beginner with FET (installed two days ago) even if I'm really very impressed! I could be able to setup every thing "at first" and to generate tons of time tables.
Said that, I've tryied to setup the constrains as suggested but I couldn't find the way  .
Can you provide me some additional details/screenshots of the constrains list you're referring to?
In particular I don't understand where to set what you called "Interval".
By constrain max days per week=2 I thought to have limited the number of presences for teacher to  2 days per week while some of them have to be there 5d/w but not to exit always at the last hour.

Vorrei impostare dei vincoli per limitare il numero massimo di uscite a settimana all'ultima ora per ogni professore.
Questo per evitare combinazioni dove alcuni sono posizionati ogni giorno all'ultima ora (ma anche alla prima).
Come posso fare?
Grazie!!!

Goodmorning, I'd like to set constrains to avoid some teachers to exit school every day of the week at the last hour.
I'd like to limit 2 activities max at the last hour over a week period, for each teacher.
How to setup constrains to do that?
Thanks!!!!