Dogen Zenji said that most people are not able to acquire the way-seeking mind of spiritual awareness without deeply understanding that a day consists of 6,400,099,180 moments... saying that there are 6,400,099,180 moments in a day is not talking about a mysterious idea; it is talking about something real... The actual numbers are not so important, but we should have a sense of how quickly time passes.

6,4000,099,180 Moments
Csaba Osvath

Notes from:
Each Moment Is the Universe
By Dainin Katagiri
(page 2-3)