I-Share books: All I-Share libraries have agreed on the same loan periods. You have a loan period of 30 days, starting when you pick up and check out the book (professors: your loan period is longer) (double-check this, that may no longer be the case). Several days before the book is due, you will be emailed a courtesy reminder from the lending library that the due date is approaching. You may renew the book online through your I-Share account (information here). You should renew the book as soon AS SOON AS YOU RECEIVE the courtesy notice. You can renew the book three times (30 days each time), and then the book must be returned.
Out-of-state books: Books ordered through the Interlibrary Loan department, through the national consortium, have variable due dates because these are set by the individual lending libraries. The due date will be noted on the blue slip inside the book. Some libraries will allow renewals, others will not.