I don?t really zone out like that with games, I do mostly with books and occasionally with movies if I end up on some thought tangent. It?s probably strongest with books because I end up watching it in my mind, so I focus on that and don?t realise I?m still reading on. Not that I don?t zone out with games, It?s just more of a, oh shit where did the last 3 hours go kind of deal. That kind of zoning out happens more often and with a lot more things.
On a similar note, anyone zoned out while they were walking somewhere? It used to happen in school going to class. I would just start thinking about something and suddenly I?m at the classroom, that or heading to a different destination than I should have been because my auto pilot got it wrong.