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611 fortnights is about three-and-a-half times as as The Construction of the Chunnel.
In other words, it's 3.666 times the of The Construction of the Chunnel, and the of The Construction of the Chunnel is 0.2728 times that amount.
(a.k.a. Channel Tunnel, a.k.a. Le tunnel sous la Manche) (1987 thru 1994) (Folkstone, Kent, UK to Coquelles, Pas-de-Calais, France)
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