One month. After the system units of the power grid company recruit fresh college graduates, they must also report to the headquarters of the State Grid Corporation for public announcement, which takes one month. State Grid Co., Ltd. was established on December 29, 2002. It is a wholly state-owned company directly managed by the central government established in accordance with the provisions of the Company Law. It is an extra-large key state-owned enterprise related to the lifeline of the national economy and national energy security.