I am getting ready to bake my first half sheet cake and I was wondering if anyone could give me guidance on how long to cook it. I normally cook at 325 and I know you have to add time for that, but I have no idea how much to add for a sheet cake. I know most of you could probably do this in your sleep so sorry for the silly question.

For a half sheet cake you should bake at 325 degrees for about 45-50 min, all ovens vary so just keep an eye on your cake, just as an FYI, you can put 1 or 2 flower nails in the pan before you pour the batter, this is to help the cake bake even, or you can use the even baking strips from Wilton. Good Luck!!!

i dont' know what size you condsider a 1/2 sheet cake. So here is a good reference chart for a lot of different size pans.

http://www.wilton.com/wedding/wedding-cakes/wedding-cake-data.cfm

and this one has rectangle shapes on it.
http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm

I bake all of my cakes at 325 degrees and I never time anything. I bake until it's done.

Wow! Thanks guys. LOVE the chart on Wilton. I had not seen that before. I have bake even strips, but I never have luck putting them on square pans. Probably the way I am doing it, but I can't seem to get them tight enough. LOVE the idea of the flower nails. How would I get them to stand up? Or do they just fall over in the batter?

Thank you leily. I figured out after I asked the question how silly it was. Don't know why I had it stuck in my head it had to be up like how it is when you make flowers on it. Sometimes I just don't think things through.