I tried the "twice, then stop rule" for meditation. Didn`t worked so well, it was too easy for me to cheat/quit. Three thoughts about quitting in two minutes and I was allowed to stop.
How do you handle this aspect?
At the moment I operate with 100% clear rules. When I meditate I always use my buzzer. 20 minutes with no room for discussion. It`s non-negotiable. Since I have implemented this rule a year ago, I`ve never failed.
I also operate with clear rules for my daily work. I set a daily goal and only stop working once I have achieved it. I fail here more often, due to unforeseeable problems.