Hi there I am new to back yard chickens, and i need some help please. I have 9 eggs in the incubator, 4 laid on one day 5 the very next day afterward. Put them in incubator on a automatic tuner temp al stayed good and humidity, and stop eggs on day 19 (last thursday). Increased humity had one hatch saturday none since no signs of hatching checked eggs they are alive from what i can tell, but when is too late to expect them to still hatch, and how long should I wait to see if the others will hatch?? Please any ideas or tricks of the trade welcome, I usally hatch out my duck eggs but tried chickens they are much harder than my ducks! LOL Please help, Thank you!!