I can't give you specific times but want to share a bit of our experience.
It took longer to get my tribe 2 yr old, 10 yr old and 15 yr old girl out of our room than I thoughtas result we arrived at Epcot just in time to see them take down the special sign for the princess breakfast entrance. .......
they were just about to open the gates so after we got thru security /ticket line a crowd had formed at the rope...
I asked my DH to go to the front and let them know we were going to the breakfast and they let us pass under the rope!
(so don't be shy if you run into a delay)
As we were quickly passing the fountain a CM in a cart was approaching us.....we said good morning and my hubbie said how about a ride....the cm said ok and we laughed.....he said "no , I am serious" so we hopped on board... he picked up another family and drove us right to the restaurant door!!
We really appreciated it , especially in the July heat!!
We were the last 2 families seated.....but were not rushed ....
Enjoy your breakfast!!
(FYI we took the bus from the CBR)