I have a site that has some small traffic. It recieves about 8 -10 visitors daily. The Average Visit Length is 13:48 (Thirteen minutes) But some stay on for 20 minutes and even 1 hour. Adsense is not performing at all on this site. I was wondering if anyone can advise me on Pop-Ups Pop-unders. Since I've heard this pay by CPM and my visitors stay on the site for so long. I think this would perferm better.