If you're not doing long-haul and don't need to sleep or work I really can't think of many Business Lounges in Australia or the Far East I'd really want to spend 5 or 6 hours in and some that you'd probably need depression therapy after such a stay. 5 or 6 hours feels like a run into town for a spot of sight-seeing, shopping, visit-a-friend, a nice break from airline food or a 'sample-the-ambiance-of-the-place.... ' trip. Add them all up and you'll have spent over a day of your holiday watching CNN, eating uninspiring muck and gazing at the usual mottley assortment (me included) of 'Business Travellers' who usually have a far better rapport with their laptops than they have with people... Get away from the airport.