I'm very surprised that it turned around so quick. There was another guy yesterday posted he got the DTV from Sydney but it took him 2 (or close to 2) weeks.
There's a great set of tools available to join all those individual PDF files into a single larger file, and it if get's too large compress the file so it's accepted by the eVisa system. The tools are called PDF24 | Free PDF Converter | PDF Converter kostenlos available online or downloadable set of tools if you're not comfortable uploading documents to their website.
It was approved today the 2nd of Nov? They're working on the weekend? I submitted my application last Sunday 27th Oct, it's currently sitting at Pending Approval, anxiously waiting . . .