They should cook pretty quickly. . .
Depending on the temp, placement in the oven (do I want the skin crispy or not) and number of breasts/size of baking dish, I can cook mine (bone in, with skin)in 35-45 minutes or sometimes a little less, depending on the size of the breasts. I usually put the biggest breasts around the outside of the baking pan and the smaller ones in the middle, more protected by the large ones. That way the little ones are not overdone (or at least too overdone) before the larger ones are done.
