LCDs dont get burn in, it was only an issue with CRT screens. An LCD might "remember" an image that has been on it for a long time, but it will go away after a period of being off.
LCDs don't burn in like CRTs do. They do, however, polarize. (which results in a similar after effect as burn-in)
It should take a LOT longer than 12 hours straight to notice any "burn in" on an LCD.
Those "pixel fixing" apps, are actually ideal for helping reverse any polarization bias on the screen. (the jury is out whether or not they actually help stuck pixels, though)
I experienced "burn in" on a Dell LCD at my last job - but the image was static for -- months. (literally)
ok, fine, it was up there for a week, and yes, it was a CRT display, this was a long time ago with my first computer, i thought its the same for LCDs
You can see how small the MacBook isn't
what are you talking about? and to who?