56 hours to 80 hours. During the training period, the new employees of the fourth company of China Construction Second Bureau mainly explained the basic situation of the company, the promotion mechanism and the company's main business, and held networking activities. The training lasts 7 to 10 days and takes 56 to 80 hours. The Fourth Construction Engineering Co., Ltd. of China Construction Second Bureau, hereinafter referred to as the Fourth Company of China Construction Second Bureau, is a construction engineering company established in 1952.