Principles
“Reduce options. Increase focus. Multiply results.”
If any task takes less than 2 minutes, it is wiser to complete it immediately rather than putting it off for later. (From the book Getting Things Done by David Allen)
Opinions
Output is everything. It doesn’t matter how much midnight oil you’ve burned or how long your time tracker has run.
Recommendations
Music to increase your focus: Brain.fm (Promising)
Decision Making
If you do not have any clear answers, then the answer is always no. You can always come back and get an answer when there is more clarity.