Slide Storage Concerns - For How Long & Archival Plastic Pages vs. Metal (Tin?) Storage Boxes

How "healthy" is it for a color slide to remain inside a PrinFile plastic page inside a PP5 storage box? How many years?
I've noticed recently that minute amounts of dust or particles seem to be able to make their way into the "pouch" where the slide is.
Some are in these three-pronged binders and others 'hanging' inside file containers with Zorb-It desiccants inside.
Of course paged slides allow for quick viewing of groups rather than picking up each one one-at-a-time.

My ancient Kodachrome slides have been in archival-grade PrintFile sleeves for...decades. More too, in the traditional yellow Kodak boxes, the earliest being 1979.
No special treatment for sleeved storage — about 300+ pages in two large 2-ring ring folders, shelf-stored and often brought out for discussion when I have dinner nights. Other slides have been cut from sleeves and mounted in polypropylene card mounts to facilitate scanning. All of these are stored in a plain, untreated wooden file box.