It seems a quick easy thing to do, just to check your email or Twitter, or answer a call.
Even though it'll only take you a minute, your mind will keep processing whatever it is you did for the next hour. And if it was something important, or irritating, or exciting, you’ll keep thinking about it for the rest of the day. Hell, maybe even a week. Wonder. Fret. Worry.
The cost of interruptions to your writing is not time. The cost is attention.
And when your attention is gone, the cost does turn into time. A minute of interruption may cause you an hour, a day, a week of split attention, and so the quality of that time spent will drop to nothing.
That cost is too high.
Kill your habit of checking in on the world. If the world needs you badly, it’ll find a way to reach you.
Eliminate all interruptions and give yourself the gift of uninterrupted writing time. Because you’re worth it.