As everyone else said don't leave the airport. Isn't it three hour check in for international flights. I would take the Air NZ flight from GC (? direct) to Auckland rather than Qantas via Sydney. Can you elaborate where you are catching this Qantas Flight from and the times. My neighbour, a pilot, was horrified when he saw the official connection times I was given for a flight from Brisbane via Sydney, for an overseas flight.