If it does not dry quickly it will likely have a mold problem. For interior wall and ceiling without insulation you can sometimes get away with cutting holes in the drywall to allow for drying and the patch holes latter. For exterier walls full of insulation and vapour barrier, the drywall should be removed along with the insulation so the wall can dry out. Wet insulation in the attic should be removed which may allow drying, vapour barrier there can be cut in the middle and folded back until thing dry out and tape the barrier back together with red( TUCK) tape.
I hope this helps.