Gday,
I'm guessing your wanting to know the requirements to be an instructor at sx.
So you need to have a Grade 2 instructor rating, Command instrument rating to do a bit of single engine IFR teaching,
but with regards to twin endorsements...you don't need a baron endorsement (which are the twins they have) because the twin teaching jobs go to the more senior people.
I don't think there are any other minimum hour requirements..