This figure is calculated from the The Annals of Aman in volume X of The History of Middle-earth. The original source records the time in 'Valian Years', specifically giving a period of 1,495 of these Valian Years from the creation of the Two Trees to their destruction. There are in fact different modes of calculation from Valian Years to solar years, so the figure of 14,325 may not be precise, but it gives a reasonable notion of the period for which Malinalda shone its golden light over Valinor.
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