I like using whatever system has one unit=what I’m measuring. 1cm is better the “a little less than half an inch”.
There was one fortnight of water in the dishwasher.
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Is that an Imperial fortnight, a Winchester fortnight, or the fortnight from the “Assize of Days and Months” as decreed by Henry IV in 1401?
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It’s the one that translates to roughly 48% of a Parsec.