Rock Around the World was on Friday afternoons and repeated Friday evening and Saturday lunchtime or early afternoon.
Triple J was also broadcast on the Gold Coast’s ABC station when it was still on AM. I read somewhere that every year over a certain period they’d have continuous 2JJJ coverage over the Christmas-new year period. I heard it over the 1985-86 Christmas-new year period when I was there for a holiday, but not the following year.