Speaking of website blockers, has anyone used the program Leech Block? Not only is it one of the better website blockers, but instead of restricting just one website, you can do so to many at a time.
On top of that, you can actually set the dates and times you want the website to be inaccessible, and when you want it to be available.
Be warned though, you can end up making a mistake where you end up permanently blocking the site. The only way to fix this it to uninstall the browser.