If the AT&T Cloud Services Billing application is idle with no screen/session activity for 55 minutes, a window is displayed with a warning that the session will expire in five minutes. You may choose to Continue or Finish the session. If you chose to Continue, the session threshold is reset. Otherwise the warning window will close after five minutes, and an error message will be displayed.
AT&T Cloud Services Billing Online Help
AT&T Cloud Services Billing Online Help Overview