In the wild tortoises hibernate for as long as the cold season forces them to. It all depends what climate zone the tortoises come from. It can be as short as one month... or as long as nine months.
These tortoises are not in the wild... think long and hard if this is what you want to do. There is absolutely no health benefit to the tortoise and it is totally not necessary. Hibernation in tortoises is and adaptation to survive unfavorable environmental conditions for survival... nothing more.
In captivity the risk dramatically increases with very young and very old tortoises.
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