If the supreme essence exists as a whole in individual times severally and distinctly, then its time-span is not simultaneously a whole but is stretched out in parts through the parts of time.
The most fundamental or ultimate reality—often what philosophers mean when they talk about God or the most basic thing that exists.
Time-span(as used in discussing how something relates to time)
The length or duration of time that something exists or covers.
metaphysics(Hartshorne's naturalistic redefinition of metaphysics)
On Hartshorne's view, the study not of realities beyond the physical, but of features of reality that are ubiquitous or that would exist in any possible world.
Suppose, on the other hand, that it exists as a whole in individual times severally and distinctly. (A human being, for instance, exists as a whole yesterday, today and tomorrow.) In this case we should, properly, say that it was, is and will be. In which case its time-span is not simultaneously a whole. Rather it is stretched out in parts through the parts of time. But its time-span is its eternity and its eternity is precisely itself. The supreme essence, therefore, would be cut up into parts along the divisions of time. (Anselm, Monologion, Ch. 21)