My moms 81st birthday is Friday. I have a square 7 x 3 inch pan. How long do I bake the cake? I am pretty sure it will be the orange supreme by Duncan Hines, which is one of her favorites.

U can check the back of the box for reference. But when I bake my cakes I check after 20 mins and pay attention to smells. After 20 mins I check more often but not too often to let it cook.