120 minutes. According to official website of Anhui Education, the full mark of mathematics in the senior high school entrance examination is 150, and the examination time is 120 minutes. The full name of the senior high school entrance examination is the junior high school graduation examination, which is an examination to test whether junior high school graduates reach the junior high school graduation level. It belongs to the academic examination and plays a connecting role. After the senior high school entrance examination, you can choose to enter an ordinary high school or a vocational high school, which is an important life choice.