I just had the impression that, if someone (and not just Hurlshot) has a hard time keeping their attention on a game longer than 30 hours, then ADD has something to do with it.
I didn't think you were trying to be insulting. Though it doesn't necessarily mean people don't take it that way. I remember a friend of mine was struggling in English 101, so he went to the teacher for help. His teacher recommended some excellent ESL (English Second Language courses) that would help him out. It would probably help a lot, except that English was my friend's native language. His last name was Le Bray, so she probably assumed he was French. I'm sure she didn't mean to insult him, but he felt pretty crappy being recommended to an ESL course when he's spoken English his whole life.
I also can imagine that it is not that uncommon if people without ADD could have problems sticking with a game for 30+ hours. Extenuating circumstances can pull a person away from a game for a while (such things as lives, kids, work, etc.). I know I usually have a hard time jumping back into a game after being away for a while. I never finished Morrowind because of that, and I'm having a hard time getting back into Oblivion because of my vacation.
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Actually, the diagnosis doesn't usually take watching TV or playing games into consideration as criteria to assess inattention or distractibility, since many kids with it WILL stay still and watch TV for hours on end.