Unless something is particularly huge (getting on for pallet sized), or sent via AusPost when they're having an off week I've never seen a package take a week to get to or from me (either in Melbourne or Sydney depending on when), and two-day or even overnight is pretty standard these days.
Extremely rare to see something go missing too, the vast majority of those that have done so have been international parcels.
If it was supposedly sent by a courier and not arrived after a week I'd be asking RS to either reship or refund.