0. It must be a finite time period from the beginning of the Universe, (like 1 billion years)
1. It must have some relevance to the story or plot
2. It cannot be open ended, 'end of the Universe' as in The Last Question
3. Any Universe is allowed provided that it has a beginning (like a Big Bang)
closed as too broad by Wad Cheber, Rand al'Thor♦, Himarm, Jason Baker, Kyle Jones Dec 6 '15 at 2:56
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I think it's in Stephen Baxter's Manifold: Time
Sheena – a genetically engineered squid, is traveling into the very deep future.
Paperback edition page 222
Malenfant said, "So the asteroid just evaporated."
"Yes, it got smaller and smaller, warmed gently by the annihilation of electrons and positrons in its interior, a thin smoke of neutrinos drifting out at light speed."
Emma asked, "How long this time?"
"The theories are sketchy, if you want me to put a number on it, I'd say ten to a power one hundred seventeen years." Even Cornelius looked bewildered now.