Im guessing about 14
including boss fights what
do you think it will be?

Less then fourteen.
id go with ten?

I wouldn't say a number, look at Portal, it had over 18 levels, but it was still under 5 hours on the first run.

I don't mind it being 1 level, as long as it's long(at least 10 hours long).

Depends on the difficulty. On the Veteran Crysis 1 it took me 4-5 days to beat it. I do have a job so that was in 6 hour stints. I'm thinking maybe 12 to answer your question. CryTek stated that it was going to be longer than your typical FPS. I guess that depends on level length and not number of levels. We'll know something soon enough.

Might now even be any levels, it could just be like half life instead of levels maybe just checkpoints or chapters?

I wouldn't say a number, look at Portal, it had over 18 levels, but it was still under 5 hours on the first run.

I don't mind it being 1 level, as long as it's long(at least 10 hours long).

you really cant call the portal stages "levels" cuz they could all be completed in under a minute, and I know for a fact that Crysis 2 will have over 8 hours of pure gameplay, and that was before a definite storyline was confirmed, after that, Crytek said it would be longer than the average studio

From what I remember, Crysis 1 had a total of 10-12 levels. Crysis 2 must at least have more than that.

Id say 9.

To me, feels like a probable 15...