The Grainger Engineering Library will staff the reference desk in-person Monday through Thursday from 10am to 9pm. From 9pm to midnight, Grainger reference librarians will work remotely answering library chats. On Fridays, the reference desk is available in-person from 10am to 5pm. Hours are subject to change. Please check the library's open hours in the right-hand column of library.illinois.edu/enx