Notice: There is no legacy documentation available for this item, so you are seeing the current documentation.
You can set a default expiry time for notification, without changing it every time you send one. If a user is not available online with a browser running, then the notification will be retried until the expiration time. The maximum value is 28 days.
You can set this expiry as a default setting, by navigating to Settings > Default settings > Default expiry for notifications & set the expiry days/time here.