Session timeout is a concept that the system uses to define a time period in which a Customer Control Panel session is valid / accessible. This time period is 15 minutes. The session timeout ensures that you are logged out of your Customer Control Panel automatically when you are not using it and helps keeping it secure.
You will encounter the below error message in case you try to perform any action and your Customer Control Panel session has timed out:
You need to be logged in to perform this action.
You need to login to your Customer Control Panel again and perform the desired action.