I basically know how to make more money. (Of course, I mean that in a fairly general sense, since if I knew some secret about it, my point here would be moot, and I wouldn't be writing about it.) What I don't know is how to make more time. A few facts follow from this observation.
I seem to be at a point where just about every minute of every day of my life is accounted for. I have little to no spare time. If it takes me a week to return your call, it's not because I don't like you, it's because I literally couldn't find a contiguous block of time sufficiently large to have a meaningful conversation with you.
In general, I'm not so worried about how long some event will take. What does bother me is any combination of:
grossly underestimating a completion time; and
not communicating re-estimates.
These two behaviours combined almost invariably waste my time, and I've already observed that I have no time to waste.
I don't assume for a moment that I am the only person who finds himself in this predicament. As such, I try hard not to take liberties with other people's time. I like to be punctual, for example. And the corollary here is that it bothers me when others take liberties with my time.