With the purchase of a CARFAX package you get access to 3 CARFAX or 6 CARFAX. 3 CARFAX and 6 CARFAX credits are valid for 4 years. The period ends 4 years after your purchase. After that the credits expires automatically. Note: This is different from the access to an active CARFAX, which is always 30 days from the date of purchase.