Question: how long does it take to cook a frozen stouffer's lasagna?
Answer:  Preheat to 350°F - turn on convection fan.  Remove aluminum lid. Bend lid slightly then place lid on tray so it is elevated over lasagna.  Place tray on baking sheet, center rack. Cook Frozen: 1 HOUR 30 MINUTES (Thawed*: 70 MINUTES)  Remove lid last 5 minutes.  Carefully remove from oven.