Final answer:
Websites that might use a duration goal are e-commerce websites, educational websites, and social media websites.
Step-by-step explanation:
A duration goal is a target time that a website aims for users to spend on their site. It is often used by websites that want to engage users and keep them on their site for a longer period of time. In this case, the websites that might use a duration goal are e-commerce websites, educational websites, and social media websites.