This is discussed in the article closer to the end, when it explains the balancing act of continuously recognizing the difference of productive, interesting wor

This is discussed in the article closer to the end, when it explains the balancing act of continuously recognizing the difference of productive, interesting work and tired, harmful work for the sake of work and showing off. PG also uses himself as an example of how the type of work can impact actual productive hours: about 5 for programming/engineering and almost a full day for coordination and communication.