American Grass Mantis (Thesprotia graminis) Lifespan?

[BepopCola]

American Grass Mantis (Thesprotia graminis)

Does anyone know how long these guys live on average?
From ootheca to expiration,
and, particularly, their lifespan after their final molt.

 

[cold blood]

They hatch early spring, mature by late summer and are usually dead by winter...id say 10 months is a good estimate.