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As for conversion time for a population:
Canada went metric in the early 70s. Adults my age + or - were schooled non-metric but we shop with it, drive it & feel it (temps). We still convert, but are getting better at actually using it. It depends what you need all of the time.
Our children are metric. When we mention miles or Fahrenheit now, they look at us blankly & start talking about dinosaurs.
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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