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Bake the lasagna for about 30 minutes while it is covered with tin foil. Remove the cover and bake for an additional 15 minutes or until the top layer of the lasagna is light brown and bubbly. Turn the oven off and let the lasagna stand for 10 minutes. This will give the lasagna time to settle.
Confidence votes 15.4K. The cooking time on frozen lasagna varies, depending on how thick the lasagna is and what kind of oven you have. A basic lasagna typically has approximately 4 layers of noodles, cheeses, and sauce. So, based on that figure, it would take approximately 1 hour at 350 F in a convection oven.f it is the meat lasagna, the directions are: Preheat oven to 375 deg, tent foil by bending in the middle and re-attaching the corners. Place on a cookie sheet and cook f â¦ or 1 hr 55 min to 2hr 5 min or until internal temp reaches 165 deg.