When eBooks are read online, they are "checked out" for a period of time that typically expires after 30 minutes of inactivity. While reading eBooks online, you can prevent the reading session from expiring by any action that updates the eBook (e.g. turning the page, etc.)
When reading eBooks online:
eBooks that are read online are considered "checked out" and may not be available to other members of your institution until your online reading session has ended.
When reading multiple eBooks online, reading sessions expire in the order that they were opened.
For example: If you check out two books, the first at 1:00pm and the second at 1:02pm, each with a session expiration of 30 minutes, the reading sessions will expire at 1:30pm and 1:32pm, respectively.
Note: An eBook online reading session is independent of a session searching or browsing the EBSCO eBooks database, which may have a different duration and expiration after a period of inactivity.