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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.
Best Answer: It takes one to two weeks for black mold to start growing under damp, wet conditions. How long it takes to grow 1 to 2 ft up a wall ...depends on the room's temperature, moisture/humidity, type of material it's growing on (plaster, wood, cement etc) & if other types of mold spores were already on the wall & ceiling's surface.