Celestia noted the number with interest, adding the age of his species to the very tiny library of information she had on the creature.  “Try not to think of it in terms of boundaries and limits, but try instead thinking in terms of ‘what is’ and ‘what is not.'” His only response was a blank, slightly annoyed, stare.  “Widen your stance, expand your vision.  Existence does not end within the confines of any one reality.  Your transition was but a drop in an infinite ocean.  You have not left in the traditional sense, merely relocated yourselves.  Nothing you, or anypony else, can do will ever halt the inexorable flow of time.  Yes, your presence here has and will continue to change the flow and direction of this ‘river’ but you will never stop it.” 