If it takes 1000 years to caculate 1 year, then their rate of time will be exactly, 1000 times slower.. 1 second for us will be 1 millisecond for them.

Anyway, cool strip.. maybe the guy in the desert was God? One day humanity will also create a simulation of the universe, who says a previous civilization hasn't done it before us? If time is infinite, then the amount of time already past must also be infinite, making the possibility of this already having happened.. 100%. If you have infinte time to roll a dice, the probabilit y of rolling a 6 is 100%