Last year I tried to incubate about 30 guinea eggs. It didn't work. Im thinking maybe I didn't do the humidity like I was supposed to. I don't have an egg turner, I just turned them every morning and night myself. Other then that time, I have never tried to hatch out eggs from an incubator. I just have chicks shipped or broody hens. I have a styrofoam hovabator. 1. how long do eggs have to sit outside in the heat for them not to be 'hatchable'? I found two guinea eggs today, and I want to try it again, this time staying on top of it. I think the eggs are new, but im not 100% sure. 2. For guineas, what temperature? I thought 98 degrees F , but just wanted to check. Is there anything else I may be doing wrong or I need to know?