When you use the computer room of the library, you will be asked to log in to your account. After logging in, the timing system will start timing and record your usage time. You can see your own use time and the maximum use time stipulated by the library on the computer screen.
When your use time is approaching, there is usually a reminder in the computer room, so that you can have enough time to save your work and give others a chance to use the computer.
It should be noted that different libraries may have different regulations and system settings, so the specific situation may be different. If you have specific questions, I suggest you consult the staff of the relevant library.