How long does it take to travel from Xi'an to Great Wall in China?

Firstly, I'd like to tell you that China Great Wall starts from Hushan in eastern Liaoning and ends at Jiayuguan Pass in western Gansu in the west, via nine provinces or cities in northern China, including Liaoning, Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Inner Mongolia, Ningxia and Gansu. So the time of Great Wall traveling from Xi'an depends on which one would you want to visit or all of them?