Which length of time is accurately represented?

A century is a period of 100 years, and the years 1300 through 1399 cover 100 years. A decade is 10 years, so 3001 to 4000 is not a decade, and a millennium is 1,000 years, so 2000 to 2010 is not a millennium. An era is a broad historical period, not a specific length of time.

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