How long can time "slow down"?

Yes. Also food for thought. Anything that travels the speed of light time stops for it. So what about light? Light travels at the spead of light. SO TIME STOPS for light. So light is traveling at infinite speed so technically is everywhere at once. Maybe the universe consists of only one beam of light? That is everywhere at once.

I’m not sure what you mean by ‘every possible reality’ but LIGO detects gravitational waves. Like ripples in a pond their effect is detected and then they move on.

Yes. Also food for thought. Anything that travels the speed of light time stops for it. So what about light? Light travels at the speed of light. So time stops for light. So light is traveling at infinite speed so technically is everywhere at once. Maybe the universe consists of only one beam of light? That is everywhere at once. Sorry for the typos in the first answer.

With the usual “I’m not an astrophysicist” disclaimers

Yes, it’s all warped, but I think you’re missing the “relative” part of it all.

In this case time appears to slow down in relation to time the observer is tracking. Since absolutely everything is warped in some way, the observation is really about the difference between one thing and another.

There is no “absolute time” to base things off of (that we know of), so all we have is our observation.

Also, spacetime is our attempt to give three-dimensional space a fourth dimension, so it’s not perfect, but might be better to think of as the medium those waves travel through.

Well. IMO, there’s a “perception” of time, that makes things seem infinitesimal, or finite…

I.E. In a dream, I may feel that I’ve been in it for hours,or days. But, in reality, it was only about 15 minutes.

It is our ’‘perception” of time, that builds the framework of our experiences here…

In the final moment of death, the mind could stretch time, to a much longer stage….

Space time is interconnect. Light speed is 286,282 miles per second. Gravity affects time. If you were in the International Space Station time would move faster for you versus me on the ground because gravity is stronger on earth. It’s miniscule but there is a difference. To stop light, the German researchers use a technique called electromagnetically induced transparency (EIT). They start with a cryogenically cooled opaque crystal of yttrium silicate doped with praseodymium.The closer you get to a black hole the slower the time until you reach the event horizon where time would stop for anyone looking at you. They would never see you pass the event horizon. You would forever be frozen in time as they looked at you. As the person looking back at someone, he would see their movement speed up and up until he crossed the horizon. Light cannot escape a black holes.