I think many are thinking too much into it. It was just a neat idea that cost very little to do and gave you a general idea of how much "saw on" time a project took. I think if someone wanted to know total project time you'd need a different approach. Maybe a stop watch and a notepad or excel spreadsheet with each step broken out. That sounds like an awful lot of effort though. The clock idea requires very little effort. I set it at 12 when I start and that's it. From there it's just recording with no input from me. Then at the end I can say "that took 5 hours of cutting, and that's not even counting prep and sanding or finishing" which is good enough for me.
I do like the idea of sharing this info though, just for fun.