Doing a surface analysis of that highlighted lots of places where I was doing something I wanted to do and later counting it as "wasted" time. So for example if I spent an hour watching a television show and later felt I had wasted an hour watching TV, I could go back and re-score that to "I wanted to watch television and I did, why are my priorities for that time different now than they were then?"
And for me, there were two things that were key to me getting better with my time. One was to be explicit about my priorities, and the other is the bin packing problem.
If you spend three hours on things, separated by 15 minutes between hours, you end up "losing" 45 minutes because 15 minutes is too short to spin up a new task but long enough to be meaningful.
If I wanted to address the bin-packing problem then it meant being a lot more thoughtful about planning my use of time. And doing three one hour things back to back (with a plan to switch tasks at the earlier of "I'm done" or "it's been an hour" that coalesces the three 15 minute chunks into one 45 minute chunk which is enough time to watch an hour long TV show if you can skip all the commercials.