Time’s arrow – our perception of time on a daily basis – goes only one way. It flies at the same speed for everyone. If you are having a great time, it seems to be fast. If you are having a terrible time it goes very slowly.
What you will do with your time is up to you. When it is gone it is gone. This moment is already passed by the time you read to the end of the line. The whole of existence is change, with you the change-rider, briefly atop the wave.
Soon you will turn under again, roll over again. You will never come back as you are. So, what are you going to do before the arrow strikes the mark and your body is recalled to the manufacturer? What matters enough to spend your time on it?