I agree. I would say an hour if you want to be relaxed and make a few trips to the buffet. You could probably do it in less if you limit yourself to 1 trip up, but Id take an hour for it.
Looking to my first visit to Disney w/ my wife & 2 DD in Nov. I cant help with any info in that reguard. As far as PS is concerned it seems to be much easier to get a PS than some other Character Breakfasts. We called around Sept. 30 and easily got a seating at 9:30, we were wanting to sleep in a little. But after reading some other posts, we decided we would like to go earilier. Again we had no problem moving it to 8:15. We are going when the parks are not that busy so that may have some bearing. But I hope maybe this helps.
What's the chance of getting there when they open for breakfast or calling from your room the night before and get one for 7:00.. We want the very first one before EE at MK but they are booked. It's the first week of Dec. any help would be nice!