Time for Processing Immigration Application

6 months or less for accessment and 6 months or less for processings. They sometimes process it very fast. your friends case could be one of them. It happened to one of my friend also that all his process took less than 3 months. So all the best.

It depends on from which country u are applying. For eg. If u are a British national the whole processing time might be from two to four months.
Check http://www.britishexpats.com. Also check the site www.austimeline.com.
"This is a site for people who have applied for Australian immigration visas. It allows users to record some details about their application and important dates in the process. This way everyone can form better expectations of what the waiting time is. "

HTH
Rajeev