messageRetentionDuration

How long to retain unacknowledged messages in the subscription's backlog, from the moment a message is published. If retain_acked_messages is true, then this also configures the retention of acknowledged messages, and thus configures how far back in time a subscriptions.seek can be done. Defaults to 7 days. Cannot be more than 7 days ("604800s") or less than 10 minutes ("600s"). A duration in seconds with up to nine fractional digits, terminated by 's'. Example: "600.5s".