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542.60 decades is about twenty times as long as a Giant Tortoise's Lifespan
In other words, it's 22 times the length of a Giant Tortoise's Lifespan, and the length of a Giant Tortoise's Lifespan is 0.05 times that amount.
(for Adwaita, an Aldabra Giant Tortoise) (Dipsochelys dussumieri, formerly Geochelone gigantea)
Adwaita, an Aldabra Giant Tortoise who lived the later part of his life in the Alipore Zoological Gardens in Kolkata, India, was 25 decades at the time of his death. Once a pet of Major-General Robert Clive, 1st Baron Clive, who is credited with securing India as a colony of Great Britain, Adwaita lived through the entirety of India's 19 decades as a British colony.
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