westjones,
We never felt rushed with our late seating at the SPB in Norway. We were seated in a little alcove off to the side. They seemed to time it well in that certain sections were seated at around the same time. So while the princesses visited in one section, breakfast was just served in another section...giving parents and children some uninterrupted time to enjoy a little breakfast and get cameras and autograph books assembled. Each of the princesses spent a good amount of time with the children and it never felt rushed. Seemed that the atmosphere at SBP was much more relaxed than that at CRT.
We had the same Aurora for both our breakfasts. At CRT, I thought she was rather cold and quick. At SPB, she couldn't have been nicer!
With character meals, we enjoy the later seating times and have never felt rushed at any of them. If anything, there seemed to be a little more time with the characters.
You should do just fine doing early magic hour at MGM then doing the late seating at SPB. Enjoy!