7 to 15 days. According to the information from official website of Tongji University, Tongji University is a national key university directly under the Ministry of Education, and one of the national "double-class", "2 1 1 Project" and "985 Project" key construction universities. After dropping out of school, Tongji University will apply for student status and report it to Xuexin.com regularly, and cancel it within 7 days to 15 days.