We were on the Dream this past Jan. We did not sit for breakfast, but went to Cabana's. We tried to sleep in a little (didn't work as they make very loud announcements at 7 am), got to breakfast around 7:45/8ish. Then, bought pix at Shutters, got off boat, collected luggage, got through customs, to car rental shuttle, rented car, drove to All Star Sports, checked into room, and took bus to MK. We were in the park by 12:45/1:00. I would say if you are first seating, which I think was 6:30, not sure how often the buses run, but I would think barring any issues 10/10:30 is reasonable....