How long does a praying mantis larvae live before entering the pupa stage?

One generation develops each season. In the autumn, females lay eggs in a large mass or cluster (an inch or so long), in a frothy, gummy substance glued to tree twigs, plant stems and other objects. Overwintering occurs in the egg stage in this case. Tiny nymphs emerge from the egg mass in the spring or early summer. They don't have a larva or pupa stage. They're born as nymphs, as in mini versions of the adults.