My runner ducks are about 17 1/2 weeks old. The 3 females have not started laying yet. I have 1 drake that is mating with 1 of my females but not the other 2. I want to see if she will hatch out any ducklings. I also want eggs for eating but I kinda don't want fertile eggs. I do not have the room to separate everyone. How long would the eggs stay fertile if I remove the drake? If I separate the drake after the females start laying will the 1 who has mated still have a chance of hatching ducklings? Please help!!!