358/2 Days The Meaning of the game's title

I think it's how many days Sora is asleep in that thing. I also think it's how many days Roxas was in Organization XIII... We never know until we find out in the game right? :D

 

I doubt that
i don't think Roxas joined the Org the exact day Sora fell asleep.
Roxas was born before Sora went to sleep, in Twilight Town but when Xemnas approached him to recruit him, Roxas refused and left.
He saw Hayner, Pence, Olette and for some reason became jealous, then Axel came and talked to him and he joined.
I doubt in that time Sora defeated Ansem and made his way thru Castle Oblivion.
And in one scene of Days, Roxas asked if Marluxia and the others were back from Castle Oblivion

 

no offense but we kind of figured it out before.

It's weird of how he was a nobody for almost exactly a year.