This means that your custom link will track the sales activity from one IP address for 30 days after the user first clicks your link. So, if one of your follower/ reader click your custom link on the 11th of the month and leave the website without buying anything at first. Then, later on the 30th of the same month, that same user (or, rather, the same IP address) comes back onto our site without clicking on your link and makes a purchase, you would still get a commission for that sale.
