I asked this question a while back and it seems that the general guideline is that the soap should be used or sold within a year. After that, it's possible the soap could dry out or lose its scent.
That said, I have some base that is over a year old, more like a year-and-a-half or two years. The bases have been stored in plastic bags and protected from extreme temperatures. They seem fine and I plan on playing with them soon. I don't sell my soaps anymore, though. I just make them for personal use. I might be more concerned about freshness if I were selling. I don't think the soap goes "bad," per se. I may just lose some of its quality over time.
_________________ - Jenny - My soapy blog: Follow me on my
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