Get to vs. have to
How much of your day is spent doing things you have to do (as opposed to the things you get to do.)
In my experience, as people become successful and happier (the subset that are both) I find that the percentage shifts. These folks end up spending more and more time on the get to tasks.
You'd think that this happens because their success permits them to skip or delegate the have to tasks. And to some extent, this is true. But far more than that, these people redefine what they do all day. They view the tasks as opportunities instead of drudge work.
A simple redefinition transformed the quality of their day, and more important, the perception of their work.