How Long Does It Take for a Moth Cocoon to Hatch?

For example, the atlas moth, the largest known moth in the world, remains in the pupal stage for about four weeks. The emperor gum moth, a large moth native to Australias, stays in its cocoon for an average of two to five years. While in the pupal stage, the moth does not feed or move as the body transforms from a caterpillar to a moth through a process called histolysis.