If the two spatchcocked chickens are put in separate pans, or are on one large sheet pan, with room between them, the time to roast them should be the same - 1 hour. If crammed together, it probably would take longer, as the hot air needs to surround the chicken to roast it most efficiently. If putting in separate pans, I'd switch the location of the pans in the oven halfway through the cooking time, as if you were baking two sheets of cookies, for more even roasting. If both are on a large sheet pan, I'd rotate it 180 degrees halfway. ;o)
3 Comments
Just test chicken with thermometer not touching a bone.