Hmm...that's a good question. Coming from my experience with sticking stuff in the oven together, I'm guessing it'll take more than 2-3, but probably not 4-5. (I'm guessing 3.5-4) Do you have a meat thermometer?
When the skin is brown and the thermometer reads 190 degrees (the number on my thermometer for poultry) then they're done.
If you live near a large grocery store (or Wal-Mart?) that is open today you might could find a thermometer. At the Schnucks down the street from me they sell them in the baking goods section.