[invertd]

Don't take this the wrong way; but a potential short answer is that there is more to life than programming. Or doing a single thing non-stop, for that matter regardless how passionate your are about it. Taking your mind off of it is not necessarily a bad thing - in fact, it might help you acquire a different perspective which ultimately might assist you in becoming a better problem solver in the long run. Also, "those" people might have different, additional and probably more important obligations such as family or children. Yet some others (as pointed above) might have hobbies which require some time investment.