Everyone that visits ABC Trainerize through your unique referral link is tracked via a browser cookie that lasts 90 days. If they return any time within the 90 days and subscribe to a paid ABC Trainerize plan, you'll be credited as the referee. If they click the referral link again, the 90 days restarts.
Important note: if they click on another affiliate's link, the cookie will no longer track for you. Make sure your referrals use only your link so that you get credited properly!