Original Polaroid Spectra Film

I'm not sure where to post this question but I thought the people on
this forum might know how archival is a late generation of Polaroid Spectra
film? I'm talking about the original Polaroid film not the Impossible Project film.
I purchased some a few years ago, used it for a project. Now the gallery that represents
me for my palladium and archival inkjet prints wants to include the Spectra work in a show.
I'm concerned because I have no clue what the lifespan is for the work.
It is archival framed under uv glass.
Thanks in advance for any help and sorry if this is the wrong forum for this inquiry.

Thom Jackson