I have two Swedish hens. We started letting them keep their eggs around the end of May (wish I had been paying more attention) and once there was about 10 eggs one of the hens started brooding constantly. We ended up with a total of 21 and then the other hen started brooding constantly. That was about 2.5 weeks ago. I am wondering when exactly the incubation period started for these two since they were still adding eggs before they both started brooding. In the last week they have kicked 4 eggs out and poked holes in them, 3 had nothing in them, but one had a partially formed duck. I am very impatiently waiting for something to happen LOL. I don't want to leave them in there too long, but I don't want to jump the gun. I can't candle them because they will not let you anywhere close to the nest. We were thinking that if they don't hatch by July 4th we would get rid of them?