a millennium
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That is by definition of the word "century". Humans like to count in powers of 10 (100, 100, 1000, etc.), since it is easiest to work with (with the numbering system we use), so humans invented a special name for "10 years", and another for "1000 years", and yet another for "100 years".
264.17 US Gallons 1 cubic metre
I've used them for many years and never heard of another name.
1000 years is called a millenium.
1000000/1000=1000 1000/365.25~2.73785079 years