Time itself is not man-made.
Time, as a dimension, exists naturally in the universe. It’s a fundamental part of how the universe operates — things change, decay, move, and evolve. In physics:
Einstein’s theory of relativity shows that time is relative (it can move slower or faster depending on speed and gravity).
Time is interwoven with space as spacetime.
So, from nature’s point of view, time is real, not invented by humans