The RAAF P3Cs do not have a air refueling capability.
Given the range at which this search is taking place, with a transit time of approx four hours each way and two hours on station, I wonder how long the current sortie rate can be maintained?
I do not know how many P3 crews they have these days, but what they may lack in numbers is well compensated by their capability. If I was lost they are the people I would want searching for me!