But at its core the post was about time management, and it basically consisted of one nugget:
Just remember: if you don’t have attention, you don’t have time. Did I have time to check e-mail and voicemail? Sure. It might take 10 minutes. Did I have the attention to risk fishing for crises in those 10 minutes? Not at all.
Attention, not time. So if spending 10 minutes to do something is going to pull on your attention for much longer than that, judge by the latter not by the former. Email and voicemail are great examples because they recursively hide additional time-drains within them.