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I'm sure something like that is possible. It's just incredible to think that your brain can somehow manage to replicate every day for ten years like that. I would understand it more if it instead fooled you to believe that it was that long but that doesn't seem to be the case here.
I'm actually quite certain that it can't, especially not in such a short period of time. At least, that would hyperexceed our current estimation of the brain's capabilities as I understand it.
What the brain can do is create a multitude of events. What happens in a coma-like state is probably comparable to what happens it the dream-state. Your brain is somehow wired to forget these events, because they're completely irrelevant to your actual life. You can however force your brain to remember them. You will then subconsciously try to link these events together, filling in the gaps as it were.
The extent to which our brain can realistically recreate events has never been properly researched. However, to suggest that it can create a full span of 10 years with all the details within the space of less than an hour is ludicrous. Not even the biggest supercomputer we currently have can come close to even a milli-fraction of that kind of processing capacity.
What I think happened is that the accident caused some kind of hotwire in his brains, releasing a ton of chemicals in his brain causing him to experience a very strong hallucinogenic effect. This kind of effect is mentioned in a comment in the thread, I think the chemical in question was DMT or something. Since the hallucinogenic effects were very positive ones, he clung on to them. To make a subject realise the difference between reality and the subconscious, you can ask them questions about intricate details of the hallucination, like the price of the house they first bought. It may take multiple of these questions to break the illusion, however in an advanced enough state of delusion, the subject will subconsciously make up these details as they go along. This also happens when they try and recall the memory, any details will be filled in on the fly.
In conclusion, to this guy, there is probably no difference between whether it really all happened in his mind or not. However, I think the mechanics behind it are more complicated than that he simply hallucinated ten years in less than an hour.