Coturnix eggs still haven't hatched on morning of the 18th day! How long did yours take?
From my understanding, coturnix are pretty reliable in their hatch times. Keep in mind I have only tried two batches of eggs, and only was able to successfully hatch one. My first batch was moving around, and a few pipped but never made it out. My second batch began hatching exactly at noon on the 17th day. However, I have heard that hatches can take up to 20 days for a variety of different reasons.
I totally understand the staring! My roommates and I did the same thing.
I hope that your eggs hatch, but if they don't, it is no reason to stop trying. I am sure that everyone here has experienced a bad hatch. My first batch didn't work because I later found out that both thermometers were off by 5 degrees. So you should check your thermometers. Also, I have heard that a dryer incubation is better (30-50% RH), until the last three days.