What is the limit when a user will get deleted or become inactive?

Also Carlos, PLEASE make it so the viewers must keep the page on top when viewing ads and make the timer stop if they minimize the page or go to another tab. This will make the advertising better and would make more people buy ads on the site. I know others have that feature so please make it happen. 

CoinAd is a great site and has always paid me on time. (about 5-7 days after the cash out request)