How to get vistors visa fast for a week - Australian Permanent resident on a Sri Lankan passport

Hi There,

I am a Australian Permanent resident residing and have been residing in Australia for the past 6 plus years on a Sri Lankan passport. I am doing some traveling with my partner who is a British passport holder.

I flew to Sri Lanka yesterday from Australia and he arrived in Hong kong yesterday from Australia to train Wing Chung and i want to join him for a week to do some shopping until we both fly back to sri lanka on the 19th Nov for a joint holiday before we both take off traveling to Europe.

Do i need apply one for less than 7 days and if i do whats the quickest way to apply from Sri Lanka

Nads