What are common durations?
Thirty days is a widely used standard. Impulse-driven, lower-priced products sometimes choose 7 to 14 days, while expensive or complex purchases often use 60 to 90 days.
The right duration depends on how long your customers take on average to decide. Measure that in your own data before choosing a term.
Why publishers pay attention to it
For publishers, the tracking window is a significant part of their earnings. A high commission with a one-day window can yield less than a lower commission with thirty days.
Always compare programmes on the combination of commission, cookie duration and conversion rate — never on a single number.