I think 25 minutes (or 20, in some versions) may be the ideal time period to get you started; not to get you to stop. It's easy to convince yourself to shut down your email, not look at any distracting websites, etc., if you can tell yourself that you have to keep it up for only 25 minutes. Once you get going, you may be able to work effectively and without distraction for a full hour, but if the pomodoro period were set to an hour to begin with, you might never have started.
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