I think Dean might've just put it into years to make Sam have a grasp of what it was like; IMO, it's Hell. There are no 'days'. The demons don't work in shifts on you. It's just eternal torture, with the odd moment of relief that only serves to bring the pain back into focus. You can't keep track of how long you're down there, only establish that, okay, it now feels like I've been tortured for longer than I've been alive or something to that effect.
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