This is where I learned to calculate distance using free fall:
According to Hesiod Theogony, Tartarus is so far "below" Earth that if one were to take an anvil and drop it from Earth, it would take 10 days and nights falling constantly to reach Tartarus.
"For a brazen anvil falling down from heaven nine nights and days would reach the earth upon the tenth: and again, a brazen anvil falling from earth nine nights and days [725] would reach Tartarus upon the tenth. Round it runs a fence of bronze, and night spreads in triple line all about it like a neck-circlet, while above grow the roots of the earth and unfruitful sea."
Converting 10 days to seconds lands us 864,000 seconds.
0.5 x 9.8 as our m/s x 864,000 seconds = 3,657,830,400,000 meters
3,657,830,400,000 meters = 2,272,870,436 miles
To put that in perspective, the distance between our Earth and Sun is 94,314,000 miles. It says that the distance between either the sky or Olympus is the same distance as this, so this is pretty crazy.