Three months. According to the information of Qingma Project of Southwest Petroleum University, it is known that the training of Qingma Project of Southwest Petroleum University lasts for three months. The size of each class in the country is about 200, and other levels of classes follow the principle of "fewer but better" to arrange the scale reasonably. By June 2020, nearly 2 million people have been trained in the "Green Horse Project" at all levels.