The present does not depend on a notion of duration, because of the relativity and volatility it possesses. It exists only in the now and never begins or ends.
The beginning of the present is located in the idealized future, that immediately turns into the now, and then vanishing into the past. The Present is relative, volatile and unattainable.
This explains its non-existence.
C. M. Lawrence | A Brief Study of Time | July 30, 2022