Lost in time

This book although at the begging I found it very uninteresting I started liking it at the end, this chapter "lost in time" put me reasoning into things I have never thought about it before for example, I had never thought about what is time. The question Savater asks him self is the same question it came to my mind after reading this chapter " Why is it so difficult to think about time?" Other thing I found it interesting is when he says "we see the present coming, we see it going away, but we never see it remaining" as he says "how can we determine a thing that is but never remains?" I think this is why it is so difficult to find a definition for time I personally think time does not has an exact definition. Also I agree with Zeno of Elea when he says that Achilles will never catch up the tortoise I compared this with what my little brother asked me long time ago, he asked me When will I be as old as you ? I told him something like Achilles and the tortoise, I said " You will never be as old as me because when you are 18 as I am now I will be still 13 years older than you". So in conclusion time is something very hard to define but indispensable for life, so for me an easy definition of time can be a point of reference for doing the activities.