Maybe your beans were not in the first flush of youth? I usually do mung beans and they start sprouting in a day or two I think, but I do notice a difference if I don't use the packet up fast enough.
Temperature-wise, room temperature seems to work OK but I think they may sprout faster if you put them somewhere warm like an airing cupboard, at least to start with.
With mung beans, I pour boiling water on them for the initial soak - they have tough skins and so that's meant to speed things up a bit. I can't remember whether that works for aduki beans as well but it might.
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