Three hours. According to Baidu map query, the bus from Tanghe to Zhengzhou is 95 kilometers, and it takes 3 hours to drive through Chengdu and Shanghai-Shaanxi Expressway. Tanghe county, which belongs to Nanyang City, Henan Province, is located in the southwest of Henan Province at the junction of Henan and Hubei provinces, bordering Wancheng District of Nanyang City in the west, Zaoyang City in Hubei Province in the south, Tongbai County and Biyang County in Zhumadian City in the east and Sheqi County in the north. Nanyang, formerly known as Wan, is a prefecture-level city and sub-central city under the jurisdiction of Henan Province, an important transportation hub in the central region approved by the State Council, and a regional central city in the border area between Henan, Hubei and Shaanxi.