Okay, so I know what you are thinking. This question makes no sense on the face of it. Of course time is a real concept. But ask yourself this.Why is it that we ask questions like 'Where does the time go?' and 'When will dinner be ready?' or 'Why is train late?' Why is it that when we are kids we are in such a hurry to grow up and when we finally grow up we wish time would slow down? Why is it those meetings always take forever but vacations never seem to be long enough.?
I ask these questions because they all show examples of how our view of time is based on perception in each of these examples. But the passage of time really does not change in any of these.
Our perception of time is also skewed by something that not many of us ever think about. That is distance. An example that is asy to reference is solar activity. We see the li of the sun. But it is always 7 minutes after it left the sun. That means what we see is 7 mintes in the past. I th sun were to blow up right now, we wouldn't know it for another 7 minutes.