When will google analytics be unable to identify sessions from the same user by default?
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Correct Answer is: When the sessions happen in different browsers on the same device
By default, a session lasts until there are 30 minutes of inactivity, but you can modify this limit to last from a few seconds to several hours. Learn more about modifying session settings.
Suppose Roberto accesses your site. Analytics starts counting from that precise moment. If Roberto does not interact within 30 minutes, the session ends. However, every time Roberto interacts with an item (for example, an event or social interaction occurs, or opens a new page), Google Analytics resets the session expiration time by adding another 30 minutes at the time when such interaction occurs.
Whenever the campaign source changes for a user, Analytics opens a new session. It is important to note that even if an existing session is still open (for example, if less than 30 minutes have passed) but you change the campaign source, this session is closed and a new one is opened.