How do you adjust the baking time for using two 9 inch cake pans instead than three 8 inch pans?

When using two 9-inch cake pans instead of three 8-inch pans, you may need to adjust the baking time. Generally, cakes in larger pans will bake faster due to increased surface area, so start checking for doneness a few minutes earlier than the original recipe suggests. Use a toothpick or cake tester inserted in the center to determine if it's fully baked; it should come out clean or with a few moist crumbs. Keep an eye on the cake to avoid overbaking, as oven temperatures can vary.