First of all, the term “cookie life” refers to the time period during which the affiliate can receive commission for a referred customer. For example, if the cookie life is 24 hours, and the referred customer completes the purchase after 25 hours, you won't earn any commission on that sale. So, even though you have technically referred the customer, you would lose the potential revenue.
When looking for the best affiliate program to make money out there, keep in mind that the longer the cookie life, the higher your potential for making money. Round Sky has a cookie life for 30 days, so the consumer you refer can come back in 4 weeks and you'll still get paid!