My goodness, what happens to me is I click something which leads to another page, then another page, etc etc. before you know it quite a bit of time has passed. What annoys me though is seeing the same pins over and over. For instance I have a lot of "drink cider vinegar and this happens" or "eat a lemon every day and this happens." I never click on those kind of things, yet there they are every single time I get on Pinterest. Other than that, I find it very entertaining.