it takes 5 weeks from the day you send for the approval application to received, sometime a bit longer, but no more than 6 weeks. if longer then that is somthing went wrong.
k-line has ship leave yoko, osaka, and nago every foright on friday morning. 2-3 weeks to NSW the melb, the SA after that WA, by the time it arrives in WA it takes 4 weeks in total.
a good custom agent can get your car out of custom and ready to pick up within 2 days. even it needs a clean! but you must provide all the paperwork and cash ready!