I got a young coturnix quail pair last Fall. The female has been laying since Feb but her eggs were not fertile. I finally am getting some development in her eggs Im incubating. Today is day 17 for one and another will be day 17 tomorrow. Im glad I read this thread so Im not worried that nothing is hatching. I see movement by candling in the one due to hatch tomorrow. I was going to assist the one that is due to hatch today but now I will just wait. Sounds like 25 days is not out of the question for days to incubate to hatch. Thanks to all for sharing your experiences.