Gar just did a ton of miles on his Fury, some days well over 500 miles. You need to change a few things, like the seat, risers, +3 forwards if your tall and a sissy bar and your good to go. So called cruisers or touring bikes are not automatically more comfortable than a Fury.
With Cannella risers, Supreme Legends forwards, C&C Sport touring seat, Ginz Sissy bar and back rest. I can have my wife on the back and do 500 Kilometers in a day with no sweat. If I really wanted to I could do Sydney to Brisbane (1000 K) in a day with my setup.
Like I stated above all those things will help with the ride to make it more tolerable, but my opinion is that no matter what you do to this bike it's never going to be a true cruiser/touring bike.
I agree with you that everyone has a different comfort level and I would say most can probably do a few hundred miles a day 2 up, but anymore than that and I don't see how you can enjoy the ride, and I like to feel the wind in my face too, but I also like to slow down and see the things that I'm driving past.
I would have to disagree about a cruiser/touring bike not being more comfortable and set-up for long distance rides, I have never owned one but I have seen a lot of them and sat on quiet a few and they have felt way better than the Fury for a long distance ride.
I would much rather have a set of floorboards to rest my feet on for a long ride than holding my feet on some small pegs, I would much rather have a true cruise control than a throttle lock or cramp buster hand rest, I would rather have saddle bags to put gear in than a swingarm bag or a backpack, and I would much rather have a fairing with windshield than the windscreen.
These are just my opinions and I know we all have different opinions, but I want the guy that's asking to know that this bike the way it is, is not set-up for long distance rides off the showroom floor and that he would have to spend some money to get it somewhat tolerable, and he can decide if he would rather spend money on the Fury and upgrade those things or just buy a true cruiser/touring bike in the first place.