Forever

Evers, the instance local to us being called Forever, are the level of multiverse of quantum mechanical historically related universes. They deal with Max Tegmark's MUHIII, and are larger than existences (the regions of quantum decoherence) and smaller than eternities (regions of different quantum mechanically related universes that arent historically related). They are what's usually referred to to be predicted in interpretations like the Many Worlds Hypothesis. The histories in sum-over-histories quantum calculations, they are exponentially larger than existences (which are the individual histories). Remember that the possible number of states of the Hubble (our local observable universe, 92 billion light years across) is some 10^10^121, making the evers of a single existence exponentially more massive. They can be described in a time dimension to be limited by characteristic timescales in which the contents of the universes are not bound to their spatial extent due to tunneling (many googolplexes of years).