[krageon]

I have had 24h+ battery life on a 64bit x86_64 machine - clearly good battery life is possible already.

Edit: Yes, this was with the lid open and me doing things. Not videogames, just some light coding.

[ubercow13]

On a form factor similar to a Macbook Air? I'm sure it is possible to have 24h+ battery life on a Linux laptop; if you ignore the other parameters (battery size and performance) it is meaningless.

[krageon]

thin, no fans, normal keyboard. I have not held a macbook air so I can't comment on weight. The battery size doesn't matter, only how long it lasts while using it :)