I had a hen I found out in the yard on a nest she made right in the dirt, half under a pile of brush.
I needed to burn the brush so I had to move her.
All those nice nest boxes her sisters use and she has to make a nest in the dirt, in the rain.
She was sitting on about ten eggs and I didn't know how long she had been on them...so no due date.
She was the hardest one to move I ever had. I had to lock her in a nest to make her sit on them again.
She was off them for about three hours...however...
Yesterday morning when I went out to check...there was peeping from her nest.
That's how I know my broodys have hatched...the peeping. Eight chicks, and she continued to sit on two eggs.
I tend to leave my broodys alone...I don't candle. All of them hatch out on their due date.
The hens do a lot better than I do with an incubator.