Nope. I've never had anything take more than a day through customs. Likely it's Swiss Post (lipos?), which is notoriously slow, as it goes to Zurich, has to pass through Swiss customs, then makes the trip to Australian and goes through Australian customs. You'll just need to pull out a bit of extra patience.
If it's Hong Kong or Singapore Post, I'd ask Hobbyking to lodge an inquiry with them as it has taken a lot longer than usual.