Set a timeout and block sites for a duration, then refresh the time limit. Plus tons of customization for every combination of limit - limit during a set time of day, or set limits /except/ during a set time of day. There are even thoughtful and creative options for making websites unpleasant to use to wean off of bad habits without going fully blocked. Everything I could ask for plus gave me some new ideas for how to manage my time and break my bad habits. I'm fully impressed.