This dating is based on the count of years in The Annals of Aman (in volume X of The History of Middle-earth), converted from an original figure of 1,495 Valian Years. It should be noted and Tolkien reconsidered both the dating itself and the means of conversion from Valian into solar years several times, so this value may not be precise, but it gives an impression of the long ages that the Tree Culúrien shone out across Valinor.
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