It reminds me how much time I have used for certain kinds of time wasters and eventually blocks the sites. I have been looking for an option less intrusive than blocking sites in the router, and this fits perfectly. I think funktionality like this, healty surfing, should be a built-in in the browser. As it stands I can see that Leechblock have some issues accurately calculate the number of minutes on a certain site. A built-in could help that.