In your LinkShare account, you can see the following items in advertisers list, the Return Days items is hard to understand.
So what is Return Days?
We found the explain from their Official site:
Visitors may not always complete a purchase at the point of click-through. The Return Days, or Return Day Benefit Policy feature allows advertisers to compensate you for sales that occur after a visitor’s initial click-through from your site.
For example, if return days = 0, compensation will only be credited for transactions made at the point of click-through. If return days = 30, compensation will be credited to your account for any transaction made by the user for up to 30 days after the initial click-through, even if the user visits the advertiser’s site directly within that time period. Please note, however, that compensation is typically credited to the last referring publisher site. Refer to an advertiser’s Terms & Conditions