In Web analytics, including Google Analytics, average time on site is a type of visitor report that provides data on the amount of time (in minutes or seconds) visitors have spent on your website. When viewing the time on site report in your Web analytics program it is important to remember that the results can be misleading because in some cases the visitor may have been interacting with your pages and site content or they could have left the browser window open and were not actually viewing your page.
See also Web analytics and basic metrics.
