Here’s something to make your head hurt: time doesn’t exist.
It really doesn’t. There’s no such thing as a ‘time particle’. Clocks don’t measure time; time is defined to be ‘what clocks measure’.
When we say ‘I’ll be there at four o’clock’, we’re only measuring physical variables based on other physical variables: ‘it’s four o’clock when the hands of the clock are in this position and I’m in this location’.
So, the answer to your question is: when a person says that time is a construct, they’re referring to the fact that there’s nothing really being measured. It’s an arbitrary system used to record a position in space.
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