We were just there Sunday night.
Arrived to check in about 9:10 for a 9:30 ADR. Seated about 9:25. Didn't order right away, as we left our table to watch Hallowishes from the outdoor observation deck. After the fireworks we ordered our flatbread appetizer. When it arrived, we ordered our entrees. After we were done, we ordered and split a dessert. Probably left the restaurant at 11 or 11:10 pm.
So, if you take the fireworks out of the equation, we probably took about 1:15 for the whole meal. Didn't feel like we rushed things. It was only two of us, but unless you are a huge group, doubt it would take much longer.
Enjoy your dinner!