Posted October 5th, 2017, 10:27 PM
QM2 can dock in Manhattan if necessary but last did so in September 2014. The Coast Guard isn't happy that her backside extends into the shipping channel.
As for eight day crossings, I brought this up with one of the ship officers at a party. It seems that 8-day crossings were also unpopular with him as there are maintenance procedures which cannot be done when the ship is underway.