Colonization begins within 24 to 48 hours once drywall reaches 20 percent moisture content

https://express-sameday-near-sinclairplatte.urbanvellum.com/posts/within-48-hours-your-water-damage-claim-stays-protected-from-fungal-colonization

No, drywall should not get wet at all—even minor moisture exposure poses a serious mold risk. Documented research shows that mold colonization begins within 24 to 48 hours once drywall moisture content reaches 20 percent, well below saturation