Australia skilled subclass 457 is applicable to the skilled professionals who have job offer from the approved Australian employer.
You must the language requirements, must have valid job experience, your qualification must match with the skilled occupation list of Australia. You will be granted visa for four years, and bestows permanent resident status to you.

Generally skilled migration programs of Australia take 6 months to process the applications.

Each case seen with different criteria, Immigration delays are common, process time cannot remain constant.