How many hours of classes are there in Tsinghua University from June 5438 to 2022 10?
48 hours. Tsinghua University, abbreviated as "Tsinghua", located in Haidian District, is a national key university directly under the Ministry of Education of People's Republic of China (PRC). In the university announcement from June, 5438 to October, 2022, 10, the time required for nucleic acid testing requires the class staff to hold the negative certificate of nucleic acid testing within 48 hours, and the school conducts accounting testing every two days.