Polished kernels last almost indefinitely provided you store it dry. The best before on my packages is usually at least two years in future. I had some that was about 3 years old and it was still good. Full kernel rice doesnīt last as long. It has fat in it that can go rancid after 6 to 12 month even when stored properly. HTH
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If it isnīt broken, it doesnīt have enough features yet.