The cookie period determines how long after a click a referral still counts.
HOW IT WORKS
A visitor clicks your link and a cookie is set. If they order within the period specified in the terms, you are credited. After it expires, an order is not attributed to you.
WHY A PERIOD EXISTS AT ALL
People rarely buy on the first visit. They read, compare, think, and return. A cookie period means you are credited for the decision you influenced rather than only for immediate purchases.
WHAT SHORTENS IT IN PRACTICE
Cleared cookies Private browsing Switching devices Another affiliate's link clicked later
WHAT THIS MEANS FOR YOUR CONTENT
Content that prompts action in the same session converts better. A tutorial where hosting is needed at step two produces an immediate click and order. A review read for research may not.
Both are worth writing, but expect different conversion rates.
CHECKING THE CURRENT PERIOD
It is in the programme terms. Do not rely on what you remember or on what another programme offers; the figure is specific to this one.