When you create a course, it is matched to a Mission/Supplication track that is the same amount of weeks. Currently, we have developed Mission/Supplication tracks that are 26-30 weeks. This means that your course must be between 26-30 weeks.
If your Church Admin has created custom Mission/Supplication tracks at different lengths, then your course will automatically use one of those if the number of weeks matches. Reach out to your Church Admin to see if your church has developed its own Mission/Supplication tracks.