Because of Granny Smith of the Apple Family, we now know that the Ponyville Snail can hibernate for up to 48 moons. This was in the episode Pinkie Apple Pie, from Season 4.

Assuming that the Ponyville Snail is similar enough biologically to the North American Land Snail (and, judging by Snails Cutie Mark, they are), the maximum hibernation period would be six Terran months. Therefore, we can conclude that 48 Equestrian moons is 6 Terran months (specifically, October through April).

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