When did the Hyksos subjugate southern Egypt?

They were able to conquer the lands of Egypt in the 18-16th century BC. Then in Egypt ruled 13-17 dynasties of the pharaohs. We can say that the Hykos created their own 15th dynasty, which ruled the Egyptian kingdom. However, the Hykos were unable to capture all Egyptian lands. Part of the Egyptian kingdom was ruled by shadow pharaohs, and their capital was the city of Thebes. The Hykos were expelled from Egypt in the 16th century BC. It was at that time that the 18th dynasty of Egyptian rulers began to rule here.