Desktop timer for Pomodoro Technique users

If you are looking to improve your productivity when you are working on a mindful task thenPomodoro Technique is the way. It’s a technique where you sit for twenty-five minutes at a time focused on one task. At the end of the cycle, you take a “required” short break and then start on your next cycle. Why twenty-five minutes and not thirty? If you find out why, let me know.