@Override
    public void setIgnoreList(Collection<String> usernames) {
        if (ignoreList.equals(usernames)) {
            return;
        }
        ignoreList = usernames;
        // Encode the collection
        StringBuilder ignoreString = new StringBuilder();
        for (String username : ignoreList) {
            if (ignoreString.isEmpty()) {
                ignoreString.append(username);
            }
            else {
                ignoreString.append(',').append(username);
            }
        }
        JiveGlobals.setProperty("xmpp.audit.ignore", ignoreString.toString());
    }
the time between successive executions of the task that will save
the queued audited packets to a permanent store.
xmppserver/src/main/java/org/jivesoftware/openfire/audit/spi/AuditManagerImpl.java