made my Home-made incubator cos my sister wanted to put some of our chickens first ever layed eggs in there (silkie eggs, defo fertile, cockerel can't leave her alone haha) most of yesterday and all of today its been at a steady 37C, but just now ((recently put an old computer fan in there to see how that would effect it) the thermometer went up to 40C for about 20-30 minutes... will these eggs still stand a good chance of hatching?
