Keyboard backlight

This is just a simple question about keyboard backlight.

Do they lose brightness overtime? How long does the keyboard backliighting typically last? Does anyone know?

I searched google and Macrumors but no one asked this question so I was just wondering. I usually turn the backlight off to save the brightness even in the extreme dark and I just touch type.


Edit: Whoops. I seem to have found it. I'm very sorry about this. If anyone else needs it, here is the thread: http://forums.macrumors.com/showthread.php?t=348970.

Mods can lock/delete this. Again, my bad.