Depends much on the industry and being the right place at the right time with the right hours. Flying a jet is very realistic if you're happy to do charter as a career. Jobs like cobham and alliance would be realistic.
Some of the projections on here are a bit unrealitic took most guys I knew around 8-10 years to get into a jet somewhere. Very few people in Australia will get into jets after a year or two in GA unless you are a second officer in QF. You will need to bust out of GA in a hurry.
Funnily enough things suddenly turned around for me. I went from GA to international widebody F/O in only a few years. You could be the same!
I assume that is for a foreign carrier? The minmums in Australia for that job alone would be nigh impossible in that time frame.