Has any body seen a duration which is below 60 seconds under the heading of "Avg. Time on Site". It seems that it shows duration only if someone stays for more than one minute and other wise it shows 00:00:00 I just wanted to confirm this matter.
this is the definition of Avg. Time on site. it is average time duration on site. if you want to show then see in report what are time spent by users on your site and then calculate avg of it. it could be any thing like under 60 seconds. or more than 60 seconds it depends on your data