In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: The Old Kingdom, in ancient Egyptian history, is the period in the third millennium (c. 2686 -- 2181 BC) also known as the' Age of the Pyramids' or' Age of the Pyramid Builders' as it includes the great 4th Dynasty when King Sneferu perfected the art of pyramid building and the pyramids of Giza were constructed under the kings Khufu, Khafre and Menkaure. Egypt attained its first continuous peak of civilization -- the first of three so-called 'Kingdom' periods (followed by the Middle Kingdom and New Kingdom) which mark the high points of civilization in the lower Nile Valley.
A: 
how long did the old kingdom period of egyptian civilization last