Interlibrary Loan items are items that are brought in from libraries outside of the Thousand Oaks Library system. Unfortunately, it is difficult to determine an exact arrival time. The automated Interlibrary Loan System is quite efficient, checking the holdings of libraries within a few days. Most interlibrary loan materials arrive at the Thousand Oaks Library within three weeks of being requested. Many arrive sooner. Some take even longer. It depends on the rarity of the item, the accuracy of the bibliographic data that is supplied by the patron and a number of other factors including postal delivery time, etc.