Because it would be out of sync with the others and/or with other processes used to measure time, an effect that hasn't been observed, which indicates that if anything changes the rate of time it does so for everything at the same time (pun intended), making it meaningless (except for some philosophers) to talk about changed time rates as they aren't measurable by any means and have no influence on the way things happen.
Originally Posted by hypergreatthing
Note that I'm not talking relativistic time dilation, which is an easily measurable and quite real thing, but rather a change in the rate of how things happen, which was what I understood hypergreatthing to be talking about.
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