Give a stream of consciousness and then the final answer. The Valley of the Kings (Arabic: Wadi al Muluk; Coptic: ), also known as the Valley of the Gates of the Kings (Arabic: Wadi Abwab al Muluk), is a valley in Egypt where, for a period of nearly 500 years from the 16th to 11th century BC, rock cut tombs were excavated for the Pharaohs and powerful nobles of the New Kingdom (the Eighteenth to the Twentieth Dynasties of Ancient Egypt).

Based on this passage, when was the valley of the kings made?
The relevant sentence in the passage is: The Valley of the Kings (Arabic: Wadi al Muluk; Coptic: ), also known as the Valley of the Gates of the Kings (Arabic: Wadi Abwab al Muluk), is a valley in Egypt where, for a period of nearly 500 years from the 16th to 11th century BC, rock cut tombs were excavated for the Pharaohs and powerful nobles of the New Kingdom (the Eighteenth to the Twentieth Dynasties of Ancient Egypt).
So, the final answer is from the 16th to 11th century BC.