Holds

A hold may be placed on an item only if it is checked out to another borrower.

Hourly Items: An email will be sent when the item is returned, as well as an SMS (text message) message if you've signed up for the service. Held for 30 minutes only after item is returned.
Daily Items: An email will be sent when the item is returned, as well as an SMS (text message) message if you've signed up for the service. Held for 1 day only after item is returned.