Archival pigment prints produced on printers like the Epson P800 or Canon Pro-1000 have the potential of sustaining their brilliance without fading for as much as 200 years when handled and stored in a box with care. Behind UV coated glass, you can expect 2/3 to 3/4 the longevity. If left out in the open, 1/4.
Firstly, one must make sure to use acid & OBA free media to print on. Canson Infinity, for instance, doesn't use OBA's in any of their papers.
These are the tools I use for long term storage:
Archival Methods Onyx Portfolio Box
The Onyx is an acid and lignin free paper lined box covered in a durable, moisture resistant buckram material. The box is hinged on the longest side allowing for easy retrieval of prints.
Archival Methods Buffered Archival Tissue
As pigment prints are prone to damage, I interweave acid free tissue paper between each piece to protect the image surface
Staedtler Pigment Liner
To sign prints, the Staedtler Pigment Liner is acid free and will not cause discoloration over time.
Temperature and humidity in the room must be controlled as well. Aim for low 70's or upper 60, away from sun, and at an average humidity of 30%.