How long do you bake a Duncan Hines double batch of brownies?

For a double batch of Duncan Hines brownies, you typically bake them for about 40 to 45 minutes. However, baking times may vary based on your oven and the size of the pan used. It's best to start checking for doneness around the 35-minute mark by inserting a toothpick; it should come out with a few moist crumbs but not wet batter. Always refer to the specific instructions on the brownie mix package for the best results.