I have 2 duck eggs and 20 chicken eggs in the incubator due to hatch in 2 days. Today I noticed one of my duck eggs pipped. I know you are not supposed to open the incubator until they are all hatched and mostly dry, but this guy may be quite a bit ahead of the others. How long can he stay in there after he hatches? I don't want to open the incubator too early and hurt the others. Thanks.