METAL GEAR SOLID 4 STEALTH UPGRADE ,HOW LONG IS 1 SESSION?

i HAVE BEATEN LEVEL 1 WITH NO ALERTS;THIS IS WHAT IGN CHEATS,CODES,&WALTHROUGH SAID I MUST DO TO RECIEVE THE STEALTH ITEM FOR FREE;HOWEVER I DID NOT GET IT ,I SIMPLY WENT TO THE NEXT LEVEL.I CHECKED MYWEAPONS,CAMOFLAUGE,&ITEMS MENU AND ALSO CHECKED DREBINS STORE ALSO.STILL 5 MILLION D.P.IS THERE ANYTHING MORE I NEED 2 DO TO GET THE ITEM FOR FREE,OR MUST I BUY IT .IF I WAIT UNTILL SHADOW MOSES I CAN GET IT FOR 2.5 MILLIOND.P.;BUT IT WAS SUPPOSED 2 BE FREE BECAUSE OF MY ACHEIVEMENT OF NOT BEING SEEN AND SETTING OFF NO ALERTS.I DONT KNOW WHAT TO DO,PLEASE HELP!!!

If you stop shouting in ALL-CAPS people may respond to you with some help.
However, most of the people here are purists so I doubt that they'd be cheating.

I'd suggest the author of the IGN Cheat codes as your first port of call...

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