How Long Does It Take For Toxic Black Mold To Grow. Toxic black mold needs a suitable material to be very wet for at least a week before it can begin to grow. When there is a chance of mold, it’s important to have a professional in to test.
How fast can mold grow? Under ideal conditions (optimal temperature and level of humidity), it takes 24 to 48 hours for mold to germinate and grow. How fast does mold grow on walls?
With the right conditions for temperature and humidity, it only takes one to two days for black mold to start growing.
Under ideal conditions (optimal temperature and level of humidity), it takes 24 to 48 hours for mold to germinate and grow. The most common spots for black mold to grow are in wet, dark, or damp places. The mold spores (as well as any contaminated materials) need to be eradicated if you don’t want the mold to grow back. When there is a chance of mold, it’s important to have a professional in to test.