No, 1.5-2 hours is not too long of an estimated time you will probably spend at the brunch. It is well organized and efficient with no long waits for check in, food, or service; however, it is a pricey event best appreciated if you are not rushing to do something immediately after imo. You will want ample time to savor the buffet items; you may want to order more than one entree; you may want one more mimosa than you planned to have; or you may want to linger over the dessert tray a little longer since you will probably be very full. When we book the brunch, I dress for the occasion and make no other hard plans until later in the afternoon/evening because it is the highlight of that day for me. However, if it were a short trip that we were trying to pack as much in as possible, I could see us walking to the MK after brunch and making our fast passes for late afternoon/evening. When we did the brunch last month, we sandwiched early evening Epcot fast passes before the Illuminations dessert party we booked for that night.