So i want to buy this but dont want it to be over in under 12 hours granted if its an amazing 8-10 hours tho i might buy it.  So in any of the reviews u guys read did they say the length of the game? 
PS: anyone know if they decided to have mod support or not.

I dont know. i am excited but i think i will just rent it seeing that it is only single player and a new IP

I've heard that it's about 10 hours long, so basically about the same as God of War 3. 
 
From the tone of the reviews, if you're an atmosphere junkie that loves games like Bioshock, then you'll like this. If you're more about the actual shooting mechanics, then you may want to hold off.

" I've heard that it's about 10 hours long, so basically about the same as God of War 3.   From the tone of the reviews, if you're an atmosphere junkie that loves games like Bioshock, then you'll like this. If you're more about the actual shooting mechanics, then you may want to hold off. "

I finished it in 9hours on normal and it's a really awesome game, i wanna go back for some achievements but i'm too tired right now.

darn i didn't know this was out yet 

I should be getting this today.  I have heard it's pretty difficult even on normal so it should take me a while to complete.  Seeing as I have work for college (which will hopefully get done) it will take me even longer

It it replayable with different factions and endings, like shadow of chernobyl?

im playing hard core and im at the bit where you fall out of the luggage hatch