Anything over 12 months ahead is a hassle. You're gonna have a hard time even finding reservations for hotels, airfare, etc,. anytime longer than 12 months...
Also you're gonna be using Quantas airlines. 75k should be enough for round trip ticket in coach. Yea go for more than 2 weeks.. its not worth such a long flight and expense of miles for such a short stay...
http://www.aa.com/i18n/AAdvantage/pa...tasAirways.jsp