Three or four years. The State Council stipulates that university interns should study for three to four years. Substitute training is a talent reserve plan for the company to independently train middle and senior managers in enterprises. Usually, I practice in different departments of the company. After understanding the operation process of the whole company, I usually make arrangements according to my personal expertise. Finally, I can be competent for the heads of departments and divisions, and the training targets are college students within three years of graduation, mainly fresh graduates.