Hidan is probably stuck in the Tomb that Shikamaru build for him.

And he is not in one piece, so Hidan is CrAzY yet Alive to date ?

Chances are Hidan is gonna starve in hunger for a while.

I'm not quite sure if he needs blood to survive. He just need CrAzY.

May be or Not ? Even I don't comprehend as Yet.