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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.
Personal experience at water jobs: Mold does not seem to grow on every job in 24 to 48 hours. Personal experience on mold jobs: The labs take 48 to 72 hours to grow mold under ideal conditions. Non-scientific experiment where mold was not visible until day 18. The guidance documents imply 24 to 48 hours for mold growth.