‘Pastime’

Whatever we are here for, we are not here to pass time. Our time is to be used and used well. You say it doesn't matter how we spend our time since nothing matters? That may or may not be so.  But it matters which.  If something does matter and you live as if nothing matters you may end up not only having wasted your time but  your eternity as well. So time  spent getting to the bottom of this question is time well spent.