Problem with productivity is that at some moment it becomes a zero sum game. e.g: let us say you code 18 hours a day. you are eating into your sleep, your physi

Problem with productivity is that at some moment it becomes a zero sum game. e.g: let us say you code 18 hours a day. you are eating into your sleep, your physical well being and eventually you will end up producing less... if not in the short term, in the long term.