Actual workplace productivity in one UK study of office workers was 2:53 in an 8:00 day. The rest was spent surfing the web, socializing, eating. I think 3-4 h

Actual workplace productivity in one UK study of office workers was 2:53 in an 8:00 day. The rest was spent surfing the web, socializing, eating. I think 3-4 hours of daily deep focus is average, 5 is exceptional. Not all in the same chunk. It sounds like you are in the normal spectrum.