I'll likely get judged for this, but I'm using a paid proprietary Windows Application (w/browser extensions) called "Cold Turkey" (no association, just a customer). It has Pomodoro Timers, but they're enforced, meaning you can blacklist out certain applications or websites during your "work" blocks and allow them during your free time. I'm doing 20/20 during the work-day, with an hour off for lunch. I'll say this abo…
"If you turn it on you'll only be allowed to visit the site for maxvisit minutes at a time, with gaps of minaway minutes in between. The defaults are 20 and 180, which would let you view the site for 20 minutes at a time, and then not allow you back in for 3 hours."