When do nymphs grow wings?

The time varies. Grasshopper nymphs take about two months. During this time, the nymphs keep eating, growing, and molting. With each molt, they develop bigger and bigger wings. After about five molts, the nymphs are full grown. Now they have wings, just like their parents do. Most dragonfly nymphs live in the water. Some take up to 5 years and 12 or more molts to become adults. They then crawl up out of the water, on plant stems. Soon they shed their final skin, open their wings, and fly away.