pt piries a strange one, as james said, they do a 24hr shift, then get the next 3 days off... they are one of the quieter stations, even more so than pt augusta, but remain "fulltime", becaus eof the Pazminco Co. Smelters (at least i think that is what they are called)...
i think the way they get away with having the crews on such klong shifts is due to the retainees, available 24/7..
by running the station like this, they can get away with having only about 16(possibly less) full timers in pirie.