From the chapter "How Long to Practice?" in Wherever You Go, There You Are by Jon Kabat-Zinn:
Recall that in a line six inches long, there are an infinite number of points, and in a line one inch long there are just as many. Well, then, how many moments are there in fifteen minutes, or five, or ten, or forty-five? It turns out we have plenty of time, if we are willing to hold any moments at all in awareness.
^z - 2009-03-09