Some developers keep their job for too little, as if they have commitment issues.
Some keep their job for too long, as if they're afraid to leave their safety zone.
What is the optimal number of years a developer should keep a job?
closed as not constructive by jmquigley, John Bode, gnat, Wyatt Barnett, Karl Bielefeldt Apr 4 '12 at 17:01
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There is no real set minimum or maximum time frame that is optimal. It is different for every person, and every job.
My advice, however, is to stay for as long as benefits you as well as your employer. That is to say, that you are in an environment that allows you to continue to develop your craft and learn new languages/paradigms/technologies.