Don't know about infrared, but frozen PanF will last forever and a few days.
I had a brick PanF 120 stored at room temp (as room decoration) since 1989- shot some (a few weeks ago) just for giggles (Rolleicord Vb) 1/2 box speed and a dab of benzotriazole, d76 1:1 at 1.3x time, 68degrees = beautiful,highlights (detail in white T-shirt) and shadows beautiful.
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