Has anyone had sucess in interfering with a hatch. I've got chicks starting to hatch but the first has been at it all night. Not a good sign? I had a thermometer problem but kept things going as it was just a few days to hatch. They've started to hatch but the first has been at it all night. While it's alive and has an air hole I would have expected it to be out after 10 hrs, right? This is my second hatching and I don't recall the others taking so long to come out. Is there a set rule as to the time from first crack to complete hatch? Or a gauge of time?