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This number is called Ten Thousand... What? Ten Thousand?
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.
There are four 0s in ten thousand, seven in a crore so eleven in ten thousand crore. That would make it a hundred billion.
tenth thousand
If you are thinking of the word 'score' as a span of life, it is of biblical origin, Leviticus 12 and Psalms 90 which quotes 'there is a use of it that refers to a span of our lives' - 'the days of our years are three score years and ten'. Also borrowed by Shakespeare in Macbeth as 'Three score and ten I can remember well,' The span of life was then considered to be three score and ten, in other words 70 years