Ocean spreading is one of the more direct & simple measurements of ancient time.
Measured today at 2-3 inches per year, which equates to ~50 miles in a million years, we can count up the mid-ocean ridges to see how long they've been there.
Catastrophic Plate Tectonics - Key to Understanding the Genesis Flood - John Baumgardner
https://www.youtube.com/watch?v=HtwJD61JSrg&t=5101s
Ocean spreading is one of the more direct & simple measurements of ancient time.
Measured today at 2-3 inches per year, which equates to ~50 miles in a million years, we can count up the mid-ocean ridges to see how long they've been there.