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https://en.wikipedia.org/wiki/Timeline_of_the_far_future

This article is one of my favorites on Wikipedia. The last bits are maybe the best for this question.

Somewhere in the very far future, time will lose all meaning. In that, the universe will be so big and so empty that if you ran time backwards it would not look meaningfully different than it running forwards. All matter that is left will have devolved to the basic particles and the universe will be in the maximally entropic state. So much so that the page correctly stops labeling time in any unit. It's not that if you could pop into this future and then look at your watch, that it would not tick. All laws of physics still apply, 'time' is passing still. It's that for the rest of the universe, 'time' has become something different. I'm not in the field anymore, but this maximal entropy and time's use are obviously linked.

A nanosecond or a gigayear are both essentially noise in the time spans that these events occur in. Time, very truly, is meaningless to our future dead universe.




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