I want to know the answer to the following question:
How long did Akkadian and Sumerian coexist as spoken languages?
All the background I'm provided with is that "Akkadian and Sumerian coexisted as vernacular languages for about one thousand years, but by around 1800 BC, Sumerian was becoming more of a literary language familiar mainly only to scholars and scribes.". Is that enough to answer the question?
Answer: yes