Know History of Gwalior and Interesting facts of Gwalior fort ,There is no proof of how long it takes to build Gwalior Fort. According to local residents, this was made by King Suraj Sen in the 8th century. He made a criminal named after Kulipa in the name of Saint. It is said that Satara gave him holy water and he was freed from leprosy.
https://www.wiki.meramaal.com/2018/08/17/gwalior-fort/