Hiya chezlaw,

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The nature of time is a toughie

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Not really. Time is a measure of change. The unit of time is a quantum change in the universe. No changes, no time, everything frozen, including time measurements instruments. No one, nothing, possibly aware of the passage of time. Time is truly meaningless ouside changes. Most people think time has to do with endurance. It is the reverse.

Got it? (it is a derived measure).