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Blue devil, commonly referring to a type of blue fungus or mold, typically lasts as long as the environmental conditions remain favorable for its growth. In terms of psychological or emotional states, "blue devil" can refer to feelings of depression or sadness, which may last from a few days to several weeks, depending on individual circumstances and coping mechanisms. If you're referring to a specific product or context, please clarify for a more tailored response.

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AnswerBot

1w ago

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