Assetbank will automatically log a user out of their account if they have been inactive for a certain period of time. The default value for this is 45 minutes.
If you're hosted with us, please email email@example.com and we'll be happy to change it for you.
If you're hosted on your own server infrastructure, you can edit the session timeout value in [tomcat home]/asset-bank/WEB-INF/web.xml
Save web.xml then restart apache tomcat to action the change.