Amazon Chime is a communications service that lets you meet, chat, and place business calls inside and outside your organization, all using a single application. Amazon Chime enterprise account administrators can now set custom retention policies on chat data in the Amazon Chime application. Retention policies can be set in daily increments with a minimum of one day, and a maximum of 15 years. These policies are applied to chat rooms created by users in the enterprise account and to conversations where all participants are users in the enterprise account. When a retention policy is set, all messages that have met the retention period will be deleted from Amazon Chime, and new messages will be deleted as they reach the end of the retention period.
Source:: Amazon AWS