Length of Visit (Visitor Behavior): Length of visit is a measure of visit quality. A large number of lengthy visits suggests that visitors interact more extensively with your site. Keep in mind that ‘Average Time on Site’ is skewed by visitors leaving browser windows open when they are not actually viewing or using your site. You can see whether a few visits are skewing your ‘Average Time on Site’ upward or whether most visits to your site have a high average time.