How long can I visit the national key scenic spots in Tiankeng Sewing?

It will take 2 days to play all the time!

Tiankeng Difissure Tourist Area, a national key scenic spot, has been listed in the list of world natural heritage protection areas. It is located on the south bank of the Yangtze River in fengjie county, with an area of more than 300 square kilometers, including six scenic spots: Tiankeng, Difissure, Longqiao River, Mazi River, Jiupan River and Maocaoba. Among them, Tiankeng Ground Fissure Scenic Area has the most scientific research and adventure tourism value. Tiankeng is called "karst funnel" in geography. Fengjie Xiaozhai Tiankeng is the largest known karst funnel in the world, with a pit depth of 666 meters, a pit mouth diameter of 622 meters and a pit bottom diameter of 522 meters. The ground seam in Tianjingxia is a hidden seam, stretching for 37 kilometers, with a seam depth of 80 to 300 meters and a bottom width of 1 m to 30 meters. It is a typical "first sight" landscape.