I had an Oryo-san cel up on my wall framed for 
about 3 years now...I had to take it down a month 
ago because I noticed extreme line fading :(  It 
was under UV glass (the white kind) and in a room 
that recieved a medium amount of light, and not 
much direct sunlight.  I think it's just a matter 
of how long you keep it up...now I plan to rotate 
my framed cels every 6 months or so to prevent 
major fading and that way I can still enjoy them 
hanging on my wall.  I never thought about 
changing the glass though every..thanks I'll have 
to try that too ^^

-Emika >^.^<