I have a blog and I occasionally check stats using Google Analytics. For some pages, I get several visits a day that have zero 'time on page'<p>Are these real (i.e. people clicking and then immediately back)? or are these bots? or is the metric just inaccurate?
If a visitor clicks through to another page on your site, the difference in time between the visits is reported as the 'time on page' for the first page. If someone visits a single page of your site and then closes their browser, it's not reported as there is no subsequent pageview.