A period of ten years is a decade.
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It's called a decade.
Two. Or three. Depends on where the first one occurs in the period of ten years, and what you reckon ten years is.
A period of 10 years is called a decade.
A period of 100 years is called a century.
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.