A Pharaoh would rule until he either died or was deposed. It was not uncommon for a Pharaoh to be assasinated. On average a pharaoh ruled about 10 years, but some ruled much longer than that, while others lasted only a matter of days.
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Actually, Kush conquered Egypt and ruled as Pharaohs for almost a century. In 656 BC, Psamtik I drove the Kush out of Egypt, to reunite northern and southern Egypt.
They invaded egypt in 1324B.C.
Kush covers about 2500 miles in Egypt.
Egypt wanted there Natural Resources
Kush pyramids were much smaller and steeper than Egypts pyramids.