In the world of analytics, the time the user spent on your site is considered which type of data?

Average time spent.

Audience flow and average page time spent on page.

average time spent.

Analytics has the meaning in the word itself, For knowing about the performance of the website, and making changes based on the performance

Its the average time spent on Google Analytics, but there are many functions there like visits, new users, bounce rate, page views, etc.

This is called the average time spent.