Yep. It's time to do this again - figure out how time works in a Final Fantasy online game!
From a FRAPS recording, a single Eorzea minute takes about 3 seconds. Or, in other words:
3 Earth seconds × x Eorzea seconds/Earth seconds = 60 Eorzea seconds
The units cancel out, leaving us with:
3 × x = 60
So x = 20.
Meaning that for every second that passes on Earth, 20 pass in Eorzea.
Cool! Now all we need to do is establish a starting known time on Earth with a corresponding known time on Eorzea.