But now everything is changing for Australians to, since ( as far as I know ) you can now apply online:
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Then the visa is send to your email, 1-2 weeks before departure.
No sending of passport is needed anymore.
And then it is waste of time to use a day of your holiday to go to a immigration office, where you never know how long the queue is.
And in Patong you hand in you applikation and passport, which you then have to come back and collect hours later.