Wet drywall becomes colonized within 24 to 48 hours of water exposure

https://express-fastresponse-near-gasstations.wordcanopy.com/posts/unlike-gradual-deterioration-sudden-water-damage-determines-your-out-of-pocket-restoration-costs

Mold begins growing on wet drywall between 24 and 48 hours after water exposure, making the first two days critical for homeowner action