I'm not a SA applicant, but I just wanted to offer moral support! I waited nearly three months between my interview and my invitation, and it was exhausting! Your status will continue to say "interview completed - addition assessment" until you hear back regarding an invitation. This status means exactly what it says - you've completed the interview and they're assessing your application. When is your know-by date? I interviewed in September for a Know-By of March 1, so I potentially could have been waiting a LONG time!