Hello John, I think what cavediver is presenting is best understood with a review of light cones. It takes time for any event to reach an observer. So lets say we had a solar flare large enough to notice the visual effects on Earth. If it happened around dusk. You would see Venus brighten first than several minutes later you would notice Jupiter brighten. So the light cone can be in Earths/ Venus's past while still being in Jupiters future.
Abe- Cavediver, I would really enjoy discussing the point Straggler brought up about entropy and how that might relate to universal time. (I know universal time is the wrong wording for it, since time is relative to the observer.) But wouldn't the universe entropy at the same or close to the same rate regardless of observation. No rush when we get to it.
Hello Stile, Although we will have to wait for Cavediver to givwe us the correct extreme condition. I do not believe any of your examples would cause an object to fail to have a collapsed wave function. I believe what CD is referring to, is a state where two systems interact while still being in a state of superposition. There by not causing a wave function collapse of any of the interacting sytems. I do not know of any real world examples where you could observe this interaction however, since any observation would cause a collapse of the wave function and your back to classical view of reality where the two objects will interact with each other.