1 to 3 months. According to Zhengzhou's paper review time query, review is the longest stage in the third review, which takes 1 to 3 months. Zhengzhou, known as Shangdu in ancient times, is the capital of Henan Province, a megacity and the core city of Central Plains urban agglomeration. The State Council has been approved as an important central city in central China and an important national comprehensive transportation hub.