The twenty-four hour lab in the Student Union Building, as per its name, is open 24/7.
Lab Hours vary, check the specific lab for hours. Generally most open at 8am and many buildings close at 9 PM.
Student Union 24 Hour Lab
William Porter Hall (SMT)
Student computer labs are available to all currently registered ASU students, faculty, and staff. These machines come with all ASU standard applications; some labs may also have specialized software. Many of these labs are used for classes; if the room is reserved for a large class you may be asked to leave. The instructor may group students to leave some computers open for others, but if you’re disruptive to the class you may be asked to leave.