Usually two years. For details, please check the announcement of local political and legal police or call the local recruitment office. The recruitment procedure of police officers in politics and law is the same as that of ordinary civil servants, but after being hired, they have to go to the prescribed institutions for two years of professional training, during which tuition fees are free and subsidies are provided. After graduation, graduate students should serve at the grassroots level for 5 years, undergraduate for 7 years and junior college for 9 years. Those who breach the contract and pay liquidated damages cannot apply for public institutions and civil servants anywhere within the prescribed time limit.