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I understood it. I have a new questions.  If the program continues  moving back and forward the number of activity can I be confident that it will produce a timetable even in days?

if I set the weight to 100 also just for some constraints, I did not receive any message but the elaboration seems to stop with one activity without trying to go back and forward again. So I decided to have a weight of 95 and in that case the program go forward and seems to try to find a solution. It is normal?

I have a schhol with 33 classroom and 2 buildings.
I can obtain a timetable only deleting some constraints. I have some ConstraintMinDaysBetweenActivities and ConstraintActivitiesSameStartingTime. Buit I have to set the Weight_Percentage to 0 in many ot theese constraints.
I tried to restore the Weight to 95 each time for a different group of constraints (each group with the same topic) but after two group the program runs for a long time without build a timetable and I had to stop it.
So is it reasonable wait for a long time. Is it possible that the program generate a complete timetable in more than 3 hours?