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It's ok. I have activities of 30mn now. But there are only some activities which during 1:30.
Others are longer like cooks which lasts 3h30. Thus on the timetable the course of kitchen appears 7 times one below the other (every 30 minutes).
Can one simplify the posting of the timetable so that cook with M ..... appears only once?

thank you very much 

Hello everyone, I begin and I am annoyed because certain activities during 1 hour, other 1:30 and I did not succeed in parameterizing courses on 30mn ?