The Only Substitute for Time is Focus
There is an inescapable setup time for all tasks, large or minuscule in scale. It is often the same for one as it is for a hundred. There is a psychological switching of gears that can require up to 45 minutes to resume a major task that has been interrupted.
— Timothy Ferris, 4-Hour Work Week
Of course, I interrupted the book I was reading to post and Tweet this.
Focus is hard.