I think that people who claim to write many lines of code per hour just don't count small amounts of time lost and don't realize it adds up or feel it should be

I think that people who claim to write many lines of code per hour just don't count small amounts of time lost and don't realize it adds up or feel it should be exempt from counting. It's like the calories in broken cookies, or the ten minutes it takes to get out the door when you only spent a few seconds grabbing a few things. One thing that I think can give you perspective is if you experience a job where you account for your time like lawyers do, in 6 or 15 minute increments. It's surprisingly hard to get your billable time over 50%, assuming you're honest about it.