public int getSeconds() {
        return seconds;
    }
Returns the number of seconds to use to filter the messages received during that time. 
In other words, only the messages received in the last "X" seconds will be included in 
the history.

@return the number of seconds to use to filter the messages received during that time.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/HistoryRequest.java