Not really criticizing him, just making some observations based on the experiences of others.
In such a state of awareness, linear time cannot be trusted to be the same as it is in waking life. A (relative) moment can last weeks, or weeks might seem to fly by in a moment. Or something in between.
In some people, this creates an information compression/decompression problem, because your waking awareness can only deal with normal linear time with events, and not everyone can expand or contract dream or atypical information to fit their waking comprehension.
Information decay can be fierce, because you are unable to “refresh” what you saw. This happens as well in waking awareness, say when you briefly meet someone new for the first time. Without seeing them again, you can measure how quickly you forget them.
And there are all sorts of other oddities that can foul up perception and interpretation.
Now I don't know if it's just me and I haven't been under general anesthesia too many times, but it seems like time stands still and it's like the mind quits altogether. You wake up (if you're lucky) and it seems that no time has passed at all.