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It's as made up as time, but it's as real as anything can be understood to be, with emphasis on 'understood'. It doesn't exist in actuality mostly because our words and models don't describe it even close to well enough to consider the actual thing. It's like a really poor translation of a word, it might get us closer to understanding what's going on but will never be if your goal is to describe it to something like the human mind.
If a one-ton boulder rolls down an Earthly hill in my direction and I don't move, what happens is not a manmade concept. Call it what you will.
Time on the other hand exists only as a useful mental tool to describe change. When I repeat the experiment of going to sleep, when I wake up it's still always now. That experiment -always- produces the same result.