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It mainly depends on your house temperature and how much they are exposed to oxygen.
However, if you keep it in a cool place you will delay them to turn to yellow quite a lot. In my experience, and...

In order to prevent these type of soaps to turn yellow (basically, any tallow based soap will unavoidably get rancid and yellow) just keep in the refrigerator. This is what I do with my Cella, P.160,...