I did this flight myself back in May. Because of the volcanic eruption in Iceland, the plane had to fly a far north route over Greenland, adding almost three hours to the trip. It was a very long flight.
Take a look at Christoph Niemann’s flight diary. I can relate to many of his observations, especially the struggle with the neck pillow. I’ve too have always wondered about that hole in the window.
See them all here.