Two to three years. The specific term of office of the secretary of the university laboratory teachers' branch may vary from university to university or from region to region. The term of office of a general branch secretary is two or three years. The specific term of office needs to be determined by referring to the relevant university statutes, trade union statutes or relevant administrative regulations. At the same time, the branch secretary may leave early for other reasons, such as transfer and retirement, in addition to changing the term according to the specified time.