Just wondered. My runner has 4 eggs that were laid at different times. I can't candle worth a darn, so I'm relying on feel. Two of the eggs have activity but the oldest egg --nothing. Originally when I candled them, they all looked viable but now I wonder if the oldest egg (which was laid on June 24th) might have died in gestation? It even has a bit of an unpleasant smell. How long should I let it remain in the nest before pulling it? It has been a month.