The Lessonpal Referral program is active until paused or terminated, as per the guidelines here.
As long as the Referral program is active, your unique referral link never expires! Click here to find your referral link.
You can earn a referral bonus as long as your referees complete qualifying events within 180 days of signing up.
As a new user who has signed up using a referral link, you have 90 days to use your referral credit for lesson purchases.
To learn more about the validity of your referrals, check out this article.