Depends on what you do to them, I suppose. I have a couple of Mean Streak photos from '96, '97, and they're still perfect. Then again, they've been in my closet in the bottom of a box, so no light or exposure or anything to harm them.
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/