Australia is skills based migration and it depends on the points you get for that. If your job is in top demand, then some people have got it in a year also. But this all depends. Employer based where employer files for your PR is even faster taking only few months. Mostly people go there using 457 working visa.


http://www.immi.gov.au/skilled/general-skilled-migration/transitional/occupations-in-demand.htm