The time span is hard to comprehend,
That video goes beyond what our little ape-brains can handle in the first minute and ten seconds!
By the end even god would consider it a horror movie.
By "handle" I mean intuitively comprehend it, like when we plan what we're going to do next week. We have a good enough understanding of reality at the mass and time scales we inhabit to make reasonably-accurate predictions about the conditions and other relevant variables we'll face in our near-term future at those scales (e.g. a 7-day weather forecast, scheduling vacation time at work six months in advance, etc.). But that ends when we die. Well, probably.
The end of our personal time might not be the end of some aspect of us that exists beyond time, and most if not all spiritual traditions (that pre-date the contemporary organized religions that bastardized them) hold that in the world/realm/dimension/whatever of spirit, time does not exist in any sense we're familiar with (or else they conceive of time as cyclical and repeating). This feels intuitively true since being dead/not-existing is inconceivable.
Sometimes it seems like possessing a mind capable of perceiving the apparent reality we inhabit while being stuck in a body that has the relative lifespan of a fruit fly qualifies as a form of psychological torture. Like we exist merely in order to be freaked out by the fact of our existence and our increasing awareness of where we apparently fit within it all, which is effectively nowhere. We certainly won't have any meaningful effect on the Universe no matter what we do, so why bother?
The 24-hour lifespans of fruit flies are only negligibly shorter than ours when set against the backdrop of a few thousand trillion trillion trillion trillion trillion trillion trillion trillion years. We're self-aware fruit flies, born without a clue, baffled and babbling nonsense and right about when we're at the point where we can just begin to make some headway grappling with the Big Questions our physical and cognitive abilities wane and shortly after that we die.
But here's the most surreal part (to me): If we were able to conduct a comprehensive survey of the entire Universe (I thought about this in terms of mass and distance, but it works for time too) then unless we possess a god-like measuring device that has a degree of precision that's presently unimaginable then for all practical purposes we do not exist beyond our own self-awareness and memories.
Just to find our local group of galaxies (much less our solar system, much less Earth, much less any individual human) an entity surveying our Universe would need a measuring device with a margin of error smaller than +/- 0.00000000001%. That's probably doable; our Local Group would appear as a tiny smudge on their chart.
If you accept the that the Milky Way is ~0.00000000000000042% of the observable Universe, by volume (astronomers' current estimate) then according to currently-accepted ratios Earth occupies 0.0000000000000000000000000000000000000000000000000000000003% of the observable Universe, which itself is only a fraction of the whole Universe (including what's beyond our Cosmological horizon as far as current data suggests). Current estimates put the total Universe as ~250 times larger than what we can observe making the total ~7 trillion light years "across" which means adding a few more zeros to the 58 in the figure above.
So for an observer who is outside our Universe, if they want to find Earth in it they'll need to be able to detect objects at a resolution greater than somewhere around +/- 1.0x10^-66 % (or more, not sure exactly since the math gets totally nuts and I got other stuff to do). That means that we, and for that matter even the Earth itself do not exist in any meaningful sense as we would fall below the detection threshold of a comprehensive survey of Everything.
Lucky for us then that we don't have to be observed by others in order to exist. Well, assuming that we're not figments of some unimaginable entity's imagination, I guess.
When all is said and done about this stuff, I'm left with the irreducible and unshakeable sense that the key to everything is memory. Not just observing and understanding everything, but the very existence of everything itself.
Without our memories, where would the Universe be? Or for that matter, would the Universe be at all? I mean, sure it would since it's what made us so it had to "be" "there" before we were wherever we are... Or did it?
Another question I'd like to find an answer to is how do we know or how could we tell that we're not creating the Universe by observing it and remembering what we observe? But memories are not the things being remembered, and if the Universe only exists (as far as we're aware) in our memories then where the hell is it in the absolute present?
Well damn, I seem to be talking myself into a mind-bending version of Solipsism. Or something.
Sometimes I wish I could just be content working 9 to 5, watching TV, and retiring in Florida to chase little balls around on well-manicured lawns as I wait around to die.