This read-write value, in minutes, configures how long a dynamically loaded Announcement file can sit in the card's cache before it is considered stale and must be refreshed from the file server. An admin tunes this to balance freshness of announcement content against unnecessary repeated downloads from the file server - a longer age time reduces server load but risks playing outdated announcements longer. For example, if an admin updates an announcement file on the server and wants gateways to pick up the change quickly, they might lower this age time so cached copies expire and refresh sooner.