How long it has been soaking is probably a fuzzy measure, unless you want to make the user of the rice cooker to use a chronometer or make the rice cooker itsel

How long it has been soaking is probably a fuzzy measure, unless you want to make the user of the rice cooker to use a chronometer or make the rice cooker itself soak the rice. As for the if/then statements, even fuzzy logic needs cutoff points.