What is time?

By definition its an indefinite continued progress of existance

But is there even such a thing?

We measure time with numbers,

But there are no numbers in the sky, on our bodies

How do we know what it actually is, if its even there

What time is it, we ask, what is the indefinite continued progress of existance

Don't waste time, don't waste an indefinite continued progress of existance

Time, a word, a thing, our existance

How would you definie it?