Thanks a lot for looking at this.
I work as a software engineer. To try and keep focused and also improve my time estimation abilities, I have a system which works as follows:
1) I write down my next take along with the time I expect to be able to comfortably complete it to a high quality standard.
2) I work on the task until it's complete or I am totally blocked.
3) I then highlight the task as follows: Green - I completed it before or on the estimated time, Orange - I completed it but I overran the estimated time, Red - I got totally distracted and didn't get it done or grossly underestimated it.
As an example, a morning would look like this:
The above screenshot is from Google Docs, but I would love to be able to do this in Evernote.
Hope this is useful.