I want to know the answer to the following question:
How long were Sasanin Persians ruling Egypt?
All the background I'm provided with is that "Sasanian War of 602–628 during which they established a new short-lived province for ten years known as Sasanian Egypt, until 639–42, when Egypt was invaded and conquered by the Islamic Empire by the Muslim Arabs.". Is that enough to answer the question?
Answer: yes