I had one of my girls go broody and found her sitting on 11 eggs in a place that was not protected from predators. I relocated the hen & eggs, but mama was so intent on getting back to her brood, she did not recognize the eggs as hers. After waiting about 45 minutes to see if she would settle on them, I moved them to the incubator. I candled them before putting them in and nine of the 11 had obvious development. Two were definitely less developed than the others, but they all went in.
Today I checked on the progress. Two had free floating yokes with no development and they were culled. One has noticeable development, but I am not hopeful for it at this time. One still doesn't have any noticeable development, but I left it in to see if it was a late addition. Seven show good development and there is obvious movement in the egg.
I have no idea what day they are on but guess somewhere between 7 and 14.