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Mold Growth in 24 to 48 hours after the flood. Image: FreeDigitalPhotos.net. A lot of people ask us how long it takes mold to grow after a recent water incident; this is the most common question that arises in a persons mind after a leak.
While both publications do not specifically state that mold begins to grow in 24 to 48 hours, this is the generally accepted time frame used by water damage responders to determine when mold begins to grow. So we have the inference from the guidance documents that mold can begin to grow in 24 to 48 hours.