Geeting a RAIC isn't difficult, but it is more involved than bizjet states. I'm guessing he/she may have had a clearance for some time and it is a piece of cake to renew.
However, accounting for time out of country can sometimes be difficult. If you've been exclusively in AUS, I wouldn't forsee a problem, but if you've spent other time abroad it can cause significant delays in processing your clearance - I wouldn't worry about it though. Get the job and take it from there.