getting in yet another tangle about time

What would our minds be like if the sun didn't rise and set each day?
I know, i know, it's really the earth turning, and we wouldn't have gravity etc blah blah, you can work out all the details of how there could be such a situation.
All i'm wondering is, what would be our concept of TIME.  would we measure it by how fast we walked, or by the time it took a rock to fall from a cliff, the time it took a seed to sprout or a plant to grow?  
We think ahead in series of days. 
Maybe we'd invent clocks even without having had sundials and stonehenge?  No we don't have the stars either, that's cheating.  No seasons.  Ok so what is time then?  
Meet me when the.... What is 'when'
Yipes.
Do we only have time because the earth turns relative to other stuff in the universe?

a grant to watch hoses

i'm thinking it would be of great value to the human race for someone to get a grant to study hoses.  to set up cameras to film them full time.  not just hoses, but electtrical cords, strings of xmas lights, string, skeins of yarn, ribbons, you know what i'm talking about!
maybe it should be crowd sourced, camera kits could be given out and the citizens of the world could record the storage of these items.  
we will never know WHY they become entangled, unless we learn to communicate with them, but we can at least seee how they do it and when.  do they entangle just when you go to get them, or just when you store them, or slowly over time.
or, oh dear, perhaps like that poor cat in a box, they only entangle if they are not being watched, in which case the camera surveillence would be a waste of time.
but wait!  maybe not!  then we would know how to keep them neat... just never leave them unobserved!