I think it's rougher for people to understand that aren't in this industry, and there are so many jobs that _do_ benefit from this in a numerical way, i.e. more parts per hour, more accounts created, sales made, etc.
I work in higher education, and it's exactly the same experience for me. 4-5 hours of productivity a day, at best, and 2-3 hours of just generally wasting time and trying to look busy/meetings/e-mails.