Originally Posted by pomkiwi

Unfortunately the rules state that you can only take a guest into the lounge who is on the same flight as you. This rule is sometimes overlooked by the lounge attendants (it happened to me when I was able to take a friend in who was going to MEL when I was off to SYD but the flights left 30min apart) but I think this is unlikely if you are hoping to be in the lounge for around 12 hours