.014 - long stories on a handheld?

I think I can officially comment on handheld video game issues since I now own a Nintendo DS. and just got Phoenix Wright 2. Now that is a really great game with great dialogue to boot. BUT it gets tiring holding a DS. Most of the action takes place through text and minimal animation. Just to get through the first case in the game, I held the DS in hand for about 2 hours. And as good as the game is, that kind of strain doesn't exactly make me run to play again.

Should games of such duration be made for any handheld(whether it be PSP or DS) or should they be left to stationary consoles?

Right now, it looks like studios are pushing for the former. Final Fantasy XIII is getting its own spinoff on the DS, Final Fantasy III is already released on it, and the next (real) iteration of Dragon Quest will be released exclusively on the platform. And it makes me wonder how long people can stand reading while holding a handheld.

Yeah, yeah...Pokemon became famous on the Game Boy. And that was an RPG too (inherent text based communication). But that had a lot less reading and more action. I certainly didn't continue to play because of the deep "conversations" I had with Pokemon trainers.

All I ask is that if you're gonna have a long drawn out story on a handheld, please, please give me some audio to listen to. I like many other adolescents sat too close to the TV and as a result have bad, lazy eyes. So I'd like to reduce my use of them. I'd also like to get arm workout in the gym and not by lifting a 15 Oz portable device for hours. Or am I the only one whose arms are a little weak?