Interesting questions. Time. What is it, really?
Is it a measurement, a thing, a concept, an illusion, all of these or none, or something else?
I think on this when I feel the seasons changing, when buggy summer gives way to chilly fall. I note it on the calendar. I think of where I was at 20, and 30, and 40, now 50. Where did the time go?
Sometimes I think it didn't go anywhere. It followed me like my shadow, and the more I tried to use it, the harder it became, until one day I quit wearing a watch. I still don't wear one. I look at time, but I don't carry it around.
The old Cherokee said "Do it now," right now. That's timely enough for me.