when they say a print will last "100 years", they mean it will last "100 years in a darkened museum, or album stored", UV light will accelerate print fading by a factor of several thousands times- i've read that 1 day in a window sill is equal to 100 years in storage.
I have made prints with the chromalife 100 inks and after a year i noticed blacks turning magenta, colours becoming more orange and magenta literally bleeding out of the black's, and that was in storage! (although I may have been using OEM inks at that time)
I just made some more prints and put them on the window sill with a book covering half the print, and after 3 weeks the print has nearly lost all colour saturation. . Also when framing if you use UV resistant glass, or have a print sealed (laminated) then it will be fade less, but in my experiences a bare print will fade dramatically in 1 week, i'm now using genuine canon inks but I'm still using the same olmec paper, so maybe canon paper works better in that regard but i'll never know because I no longer do my own printing.
If I was you I would probably get them done through somewhere like photobox, order before 4pm and you'll get them the next day, cheap and genuinely will not fade in any noticable length of time (I have 7x5's blue tacked on a sunlit wall which have been there for 2 years and haven't faded one iota)