When a recurring class is created, it will be repeated on the calendar for the next 3 months. If you switch to month view and go 3 months into the future you will start to see your class will stop repeating. Don't panic though, every week a script is run to add an extra week of classes based on the underlying rule for each class, so you should not have to reset up your class schedule every 3 months.
**Note: if you find that your schedule is not keeping up with these guidelines send our support team a message and they will manually refresh your schedule to get it back on this timline.