The time it takes for mold to grow on damp clothes left in a dryer can vary depending on several factors such as the level of humidity, temperature, and ventilation in the area where the dryer is located, as well as the type of fabric and the extent of dampness.
In a typical household environment with moderate humidity levels, it may take anywhere from a few days to a couple of weeks for mold to start growing on damp clothes in a closed dryer. However, it's important to note that mold growth can be accelerated in high humidity conditions or if the dryer is located in a poorly ventilated area.
To prevent mold growth on damp clothes left in a dryer, it's essential to promptly remove the clothes from the dryer after the drying cycle is complete and ensure proper ventilation in the area to reduce humidity levels. If you do encounter mold on your clothes, it's important to handle them carefully, as mold spores can cause health issues when inhaled. Washing the clothes with hot water and detergent, and thoroughly drying them afterwards, should help eliminate the mold.