When we changed to an open/close system, we increased our tracking cookie to 180 days. That means anyone who uses your affiliate link and enrolls within 180 days will be credited to you. That should cover the months between enrollment periods. We do recommend that you direct them to the waiting list during the closed periods so they can receive a reminder when enrollment is opening.
Here is an Affiliate Handbook that you can download that has more information about this and other f.a.q.‘s.
Please feel free to email us at [email protected] if you every have any affiliate program-related questions.