For approximately how many years did the Sumerian civilization last?

Question: For approximately how many years did the Sumerian civilization last!?
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The sumerians established their civilisation by about 3500 BC, including several cities, like Urk, Kish, Nippur and Ur!. Their civilisation lasted well over 1,000 years before it fell to a Semite warrior people from the north, the Akadians, and even then Sumerian culture continued to dominate the new empire!. The Akadian empire lasted for about 200 years (2371-2159 BC)!. The sumerian civilisation was absorbed by Babylonia, and later by Assyria!.Www@QuestionHome@Com