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13 feet is about two times as long as a Twin Size bed
In other words, it's 2.1 times the length of a Twin Size bed, and the length of a Twin Size bed is 0.4808 times that amount.
(North American/Australian standard; length; mattress only)
A Twin-Size mattress measures 6.250 feet from head to foot. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m (49 sq. ft) for those in positions of wealth or power.
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