Imagine you have a spoon and you dig out one scoop of soil from the ground in central New York. Then you put that soil in a bag and carry it with you as you travel from there to the Grand Canyon. You repeat these steps until you have created another Grand Canyon in New York and Filled the original one in Arizona. Now reverse the steps and then repeat over and over again, say a thousand times. After that, you still have forever left.
Eternity does not exist for us mere mortals.