The answer to this question may depend on a few factors, but in general, sheet cakes take longer to bake than traditional cakes. This is because they have a larger surface area, which means they need more time to cook evenly. Additionally, sheet cakes are often filled with ingredients like fruit or nuts, which can add to the baking time. However, if you follow the recipe carefully and keep an eye on the cake while it's baking, you should be able to get a perfectly cooked sheet cake every time.