Once you write it down on your calendar, you try your best to honor it.
If you use an online calendar or a planner, chances are you often use time-blocking when you have an important meeting, a presentation, or a coffee date with a friend. Once you write it down on your calendar, you try your best to honor it. Similarly, when you allocate time for writing throughout the week, do your best to honor that time–even if it is only 10 minutes three times a week during lunchtime.