The steps to make an appointment for 8 hours in the library of Shenyang University of Aeronautics and Astronautics are as follows:

1. First of all, you need to log in to the official website of the school library and find the entrance of the reserved seat function.

2. Choose the time and place for the appointment. If you need to make an appointment for 8 hours, you generally need to choose options such as "All Day" or "Long Time", and then choose the seat type and location to be reserved.

3. Fill in the reservation information. You need to enter student information (such as name, student number, contact information, etc. ).

4. Submit an appointment application and wait for review.