Half a year. According to the relevant information of "Regulations on the Management of Student Associations in Jiamusi University (Provisional)" issued by official website of Jiamusi University, the backbone training courses of student associations need to be held once every six months, in the form of "online+offline" for two weeks. Student backbone refers to student cadres, and backbone refers to the main part, main pillar or the most essential component or part of something.