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Thanks for that tidbit, I had to look it up. This wiki page (https://en.wikipedia.org/wiki/Bacillus_cereus) says, "Germination and growth generally occur between 10 °C and 50 °C, though some strains can grow at low temperatures". I just measured the rice in my Zojirushi cooker, and it read 70 °C.

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But presumably the GP isn't keeping the rice cooker on keep warm for days. All the moisture would be lost. Safer to refrigerate cooked rice.

Whether they are or not: it is absolutely something that is fairly commonly done. Sealed cookers can do it pretty well, the rice is essentially fine for that long (safety aside).

I think that's exactly what GP is doing

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