What does the Days Since Last Visit rule do?
The Days Since Last Visit rule lets you set the lightbox to display based on when the user last visited your site. You can set the lightbox to display if the user has viewed the site less than a certain number of days ago, more than a certain number of days ago, exactly a certain number of days ago, or on all views except for those taking place on a specific number of days since the last view.
You could use this rule to encourage infrequent visitors to your site to come back more often, or show special promotions to frequent visitors.
NOTE: Please note that most modern browsers save your browsing session. The reason they do this is so that next time you go to a website, the website loads faster. Therefore if you close your browser and come back to your website after a few minutes, you won't see your lightbox. Usually it takes a few days for the session to renew.