I'm often asked by clients who look through their Log Stats, such as Statcounter and Google Analytics, why people are "only spending 0 seconds" on their site. "How is it possible for so many people to spend less than a second on the site?" they ask.
"0 seconds" does not indicate that your visitor came to your site by mistake or spent only a fraction of a second there. It indicates that the visitor looked at only that one page. The analytics program can only measure time spent on your site if the visitor clicks on another page on your site.
While you need at least 2 points in time -- 2 pageloads -- to compute a visit length even that may not be completely accurate. AOL users, for example, will generate 0 second visits because their IP changes constantly.