I'm pretty sure 3 days is the default cookie length. But I agree that 30 days is better if not 90 or 255. There is no
consumer-affiliate linking with CCBill right now under the classic program so that means if they were to purchase a 3 day trial from your affiliate code, cancel, then come back and buy a membership 30 days later and keep it for another year you get nothing but the initial trial because you only have that 3 day cookie.