I'm not sure of the origins for the theory of #2 but it could be used as a sort of description for #1, really. But rather than calling it a fugue state I'd call it dissociation instead. I don't dissociate thanks to a dissociative disorder (though I do sometimes dissociate during extreme anxiety or a bipolar mood episode) but those do exist -- I dissociate from my surroundings frequently thanks to the ADHD. And when I do space out, time seems as though it ceases to exist, at least from my perceptual angle. Or else it seems to move so slowly. Hence the joking phrase: "in ADHD there are two senses of time. Now, and Not Now."