How long has the director of jinan military area command Corps of Engineers personally led the working group to stay in the company?

The engineer training staff of jinan military area command paid close attention to every move of the performance field, listened carefully to every word of Guo Xingfu, and recorded something in the notebook. He is thinking about how to transplant this good method into the professional training of engineers. What training course do you choose for pilot transplantation? Soon, the Second Company of an engineering construction group in jinan military area command was selected as the pilot company to study Guo Xingfu's teaching method, and the director of the Military Industry Group personally led the working group to stay in the company for three months.