Rob, it depends a little on the manufacturer of the paper, but only by a few
months. The biggest problem with aging color paper is gradual exposure of
the blue layer (yellow dye and visual stain) by ambient radiation.

Although freezing will help to slow down any aging of the chemicals (color
couplers) in the emulsion, the radiation in our atmosphere will gradually
cause an increase in yellow stain, resulting in poor whites. Most color
papers are dated for about 18 months from date of manufacture.

Unless you have a lead lined freezer, you will see some change around one
year, and a very noticeable problem by two years. I would suggest you
purchase only the paper you plan to use within six to nine months to be
safe.

Probably around 10 years.

John
www.puresilver,org