The academic system is determined by each school, and the academic system of different schools is different, even if the academic system of different majors in the same school may be different. Most schools specialize in two years, and some specialize in two and a half or three years. For example, the academic system of Master of International Business in Nanjing University Business School is 3 years, while the academic system of Master of Accounting and Master of Audit in this school is 2 years.
Generally speaking, some colleges and universities study for a master of science for 3 years and a master's degree for 2 years, and the master's degree needs a certain period of "internship" or "practice" (you have to arrange an off-campus tutor). For example, Xiao Xi's cousin's master of media major in Hunan University is also a similar training model. The engineering major in the same school is only three years, and there is no obvious difference from the master's training plan except for an off-campus tutor.
There are differences in postgraduate training programs in different disciplines, just as the differences in postgraduate recognition in different institutions of a major are not reflected in the academic system, but in the popularity of institutions and disciplines. For example, Tsinghua University's two-year master's degree is definitely more recognized than a pair of students with the same major who have not graduated from university for three years.