72 hours is a bit short. 30-days is standard for an affiliate cookie, unless you are trying to pull some shit..
this new fetish social site
https://fetishmodelnetwork.com/ does lifetime affiliate credit. affiliate cookies last 30-days. if a member joins with your link within 30 days, they pay 10% for anything that member buys - for life. not just on that incoming sale. that's your member for life..
pretty cool concept..
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