I've had coturnix quail hatch anywhere from day 16-21. We have 4 in our mini bator that spent their first 6 days under a broody hen until she abandon them. They were still warm when we put them in the bator. They went into lockdown yesterday and haven't seen any movement yet, and really not all that hopeful but had to give them a chance just in case.
Have more eggs on their way which we are hoping to set on Thursday.