IMHO- I would say if the temp stayed at or around 99 it will take a few days past 21 to hatch. the lower the temp the longer it takes but you can go too extreme on the temp. Don't let it jump past the 101.....101 is the best temp I have found for hatching .....
By the way, I got 1 white guinea and 2 pearl grey guineas yesterday and a turkey is hatching, anyone know much about how long it takes for a derned turkey to hatch completely.....he pipped about 8 last night and just has a tiny hole. I can see his beak opening and closing but the edging was a little bloody, I am wondering if he tried too early. I figure he is soaking up all the blood before continuing on.
What you guys think?
Come on chickey and turkey, lets have a race!!!!!!!
I am trying to be patient.......it is hard!!! Hatch already you guys!!!!