Their current premium papers - namely, Fujiflex, Maxima, and Super C ii - claim a special treatment which prolongs their storage life before evident base yellowing. I think the widest roll which will fit in my freezer is 24 inch. I always seem to have leftover portions of 30 or 40 inch wide rolls which never get used in time before they go blaah. Ordinary cut sheet CA is easy to use up in time.
But I might try to acquire a roll of 24 inch Maxima once weather-related shipping issues calm down (and before potentially insane new tariffs arrive). That's a roll width harder to get than typical 20, 30, 40, and 50 inch sizes, but would be easy to cut down into either 20x24 or 24X30 sheets as needed.
I once had a 40 inch roll of Fujiflex which was good for 5 years before symptoms of aging. I never refrigerated it; but the climate here is generally cool due to coastal fog.