He might get alittle sore after awhile,perhaps more with Spider-woman

I'm sure it gets super sore from time to time.

Eh, realistically yeah he would. But he also has the super durability thing going for him, as he doesn't feel pain like normal people do. And being indestructible, I figure having his neck at an odd angle wouldn't be on the same level as being thrown through a building on the 'how much damage it causes to the bone structure' which is something he deals with weekly without any sort of complaint.

http://www.youtube.com/watch?v=Ywo6F4xYTvA

I think it might take more like... 30 hours, maybe. It would take a lot longer than you or I.

He can stay in the sun and survive . Which has the most gravity in our solar system (I think thats the term for a collection of planets rotating a sun)

I don't think a little bent neck would make him sore.

Plus...He can reach china in like 30 seconds from Metropolis. So what seems like it would be a long time would be like looking up at the sky then looking down for him.

Last I checked, the explanation as to why Supes can fly has something to do with the psionic manipulation of 'gravitons' around him, essentially making him fall wherever. In that situation, there wouldn't really be that much of a downward strain on the neck, I guess.

this, okay this I get,
and when you put it in this logic that would
be very similar to a person floating underwater,
the body would naturally level out horizontally when traveling,
I like this answer.

I like how Supes flies in Batman Beyond. The only reason for him to fly the way he traditionally does is wind resistance, but screw that, he's superman. He'll just force his way through the air with the power of overpoweredness.

https://www.youtube.com/watch?v=AKpGn1pyQyo

lol, that was kind funny, but I think that was the squid trying to fly more then it was
super man, I need to watch through this series, I love the JLA/JLU show, don't
understand why I've never sat down to this one.

Superman is faster than a speeding bullet though, he wouldn't be flying for 20-30 minutes at a time. Anyways, I'm guessing that gravity might have something to do with it, so whether the source of his flight / removal from gravity is localized somewhere on his body or if it's generalized might have an impact on the questions.

I feel a more appropriate question might be "Could an astronaut in zero-G feel a cramp from looking up for too long".

I doubt he keeps his neck in the same position for the 20-30 min, and most of the time, he should be looking down so as to scan for people below him that need help. Besides, I think he can make it to Saturn in about 4 min, so him keeping his head in the same position for 20 min should be unusual.
Whenever it doesn't make sense, just remember; tactile telekinesis.

Check out All Star Superman. It really embraces the bonkers that is Superman. For example, he has a pet Sun Eater that he feeds by creating miniature cosmoses by striking a special orb on an anvil.

I liked that movie,
it was a little sad for a superman movie,
and a tad contradicting to any of the Super man series
but I thought it was really cool.

Hmm, I'm going to go ask /r/asksciencefiction this question.

If you get curious what is said there http://www.reddit.com/r/AskScienceF....._super_cramps/ They have strict rules on keeping the responses "In character" for what ever universe the question is being asked in.

thank you so much for that link,
that is really cool, but......I didn't answer anything,
but it did at least bring the concept up in discussion,
I'm starting to agree with most folks here, the lack of
gravity forming around him is preventing the cramp
from ever occurring.

but thanks just the same.

Well, in terms of muscle cramps, Superman's neck is like Batman's legs; They can take a lot of abuse and straining.

Neck is the strongest muscle in human body, to carry the head.
So basicly if you look up the roof while you standing, you neck will get sore.
If you do the same thing lying on floor , head up looking at wall, neck won't get sore, will at least not as fast as if you are standing.
My guess is gravity pressure.

In Superman terms , he feels no pain, so doubt his neck will get sore.
In Batman animation movie , the dark knight returns part 2.
Batman shoot kryptonite at Superman, after that Superman became vulnerable to Batman attacks, his face get all bruise and swelled from Batman punches, "kneeing in front of Batman" he told him"Now you can feel the pain. Feel what us humans have to live everyday on this planet"
Or something like that. <_<

Dang I talk to much lol.

That sounds way different from Frank Miller's original comic. That one kick-ass moment I remember from it was how Supes survived the Huge Nuclear Cold Bringer, the Czar Bomb, and how he was pretty much flesh and bones after that and had to re-tank his life power from a flower.

I mean, what's the level of nuclear radiation inside the sun compared to Ground Zero for the Czar bomb? Anyway, that Superman Castle inside the sun must be nonsense, even if Supes himself can survive in there, certainly no other structure in the universe could. At least none smaller than the sun itself.