And Dispensationists would not disagree that there is only 'one' time, one Plan of God, but only that within that period of time, God works different ways.
And that view is what the note would seem to support.
Different, how? Do you mean people are saved differently? What is the real significance of this alleged "difference" that we would need to mark it off as different times? Unless you can say categorically what is different there is no way you can say how many of these things there really are. You need to avoid being arbitrary. That is the real objection to the dispensational system.
Ive already said there are but two "dispensations" (as it is historically used) during this present covenant of grace, what we call the Old Testament and the New Testament.