Ten thousand years is called a "decamillennium." The term "millennium" refers to a period of one thousand years, so ten of these periods constitute a decamillennium. In broader historical contexts, such long time spans can also be referred to in terms of epochs or eras, depending on the specific focus of study.
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No, a decade is 10 years
That's called a millenium.
The year 1013 AD.
103= 1000 or "One Thousand." ■
A period of 10 years is called a decade.