Of course anything one chooses is okay--it's silly to say otherwise--and it has already been mentioned that too much screen/chair time can harm you significantly. That said, I have never encountered a single hacker I would call a guru. or look up to, who did not hack for fun; often in more than one area. It's an incredibly deep, always evolving field and it's a vanishingly rare job that allows one to continue to grow on the clock.
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Of course anything one chooses is okay--it's silly to say otherwise--and it has already been mentioned that too much screen/chair time can harm you significantly. That said, I have never encountered a single hacker I would call a guru. or look up to, who did not hack for fun; often in more than one area. It's an incredibly deep, always evolving field and it's a vanishingly rare job that allows one to continue to grow on the clock.