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Time for quantum effects to generate a new Big Bang, resulting in a new universe. Around this vast timeframe, quantum tunnelling in any isolated patch of the now-empty universe could generate new inflationary events, resulting in new Big Bangs giving birth to new universes.
Because the total number of ways in which all the subatomic particles in the observable universe can be combined is , a number which, when multiplied by , disappears into the rounding error, this is also the time required for a quantum-tunnelled and quantum fluctuation-generated Big Bang to produce a new universe identical to our own, assuming that every new universe contained at least the same number of subatomic particles and obeyed laws of physics within the landscapepredicted by string theory.