How can I define Double/Triple etc lessons?

In case, that you need to create a lesson, which is continuously longer than one period , you can select its "length" in the Lesson dialog. For more details please check this picture:

Note:
- max length of the lesson can be set to 8 continuous periods. If you need to set longer lessons, create them more times shorter and then use advanced relations to keep more lessons continuous
- longer lesson will be visualized with longer cards according its length.
- from default these lessons can not span over set breaks. See:
Certain longer lessons can be over all breaks
All double lessons can be over certain break