When we boarded the Quantum, we completed the muster drill and went to our room, this was before noon. I opened the firedoor so we could get to the room and pick up our keys. Ran into our stateroom attendant who told us the rooms were not ready yet and told him we knew but wanted to drop off a few things and collect our Sea Pass Cards.
We then proceeded to deck 12 and again, opened the firedoor, and proceeded all the way aft to the suite lounge where we hung out until noon when Coastal Kitchen opened and we went up for lunch. By the time we finished lunch the cabins where ready.
Right or wrong I do not know but we just wanted somewhere comfortable to wait until we could get to our room and the suite lounge was the very place we found that. Of course there was no service or anything other than coffee or tea from the machine available but that's okay, the chairs were wonderful.