The duration of visit measures the average time spent on your website by all visitors. Duration of visit can also be an indicator of the interest generated by your website, or lack thereof. There is often a high correlation between visit duration and prospects answering a call to action. It would be beneficial to monitor this statistic closely, especially when making any changes to your website. You want visitors to hang around long enough to take the desired action – subscribe to a newsletter, make a purchase, or opt in for additional information.
Obviously the longer the visit duration the more time visitors are spending on your website. One of the biggest factors in search ranking algorithms used by the major search engines, especially Google, is page relevance. The more time visitors spend on your website, the search engines have no choice but to assume your website is generating a lot of interest with highly relevant content.