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So, to an accuracy of a factor of 10:

  smallest theoretical scale is 10^-35 m, i.e. Planck length
  smallest observed scale is 10^-19 m, i.e. quark interactions
  smallest life scale is 10^-6 m, i.e. bacteria and viruses
  size of vessel of consciousness is 10^-1 m, i.e. human brain
  largest life scale is 10^3 m, i.e. Blue Mountain honey fungus
  largest observed scale 10^26 m, i.e. the cosmic horizon
  largest theoretical scale is unknown
Looking at this sequence of orders of magnitude, i.e. (-35, -19, -6, -1, 3, 26, ???) makes me wonder:

* is there a theory that encompasses General Relativity and defines a theoretical largest possible distance/time?

* perhaps consciousness, being in the middle, will never, via mathematics, unite such a theory with Quantum Mechanics



For those that wanted a visualization

  10^-35 - Planck length
  10^-34
  10^-33
  10^-32
  10^-31
  10^-30
  10^-29
  10^-28
  10^-27
  10^-26
  10^-25
  10^-24
  10^-23
  10^-22
  10^-21
  10^-20
  10^-19 - quark interactions
  10^-18
  10^-17
  10^-16
  10^-15
  10^-14
  10^-13
  10^-12
  10^-11 - hydrogen atom
  10^-10
  10^-9
  10^-8
  10^-7
  10^-6 - bacteria and viruses
  10^-5
  10^-4
  10^-3
  10^-2
  10^-1 - human brain
  10^0
  10^1
  10^2
  10^3 - Blue Mountain honey fungus
  10^4
  10^5
  10^6
  10^7
  10^8 - Diameter of our sun
  10^9
  10^10
  10^11
  10^12
  10^13
  10^14
  10^15
  10^16 - Oort cloud
  10^17
  10^18
  10^19
  10^20 - Our Galaxy
  10^21
  10^22
  10^23
  10^24
  10^25
  10^26 - the cosmic horizon


>is there a theory that encompasses General Relativity and defines a theoretical largest possible distance/time?

It's possible to define a universe of nearly any possible shape, but most aren't really compatible with our observations. One that fits reasonably well would be the de Sitter space, which fits most important criteria, and has a finite size at each moment in time.




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