hey i havent but i had a chick hatch at 27days this week i was told it was impossible but it wasnt i was amazed and some smaller breeds of hens only take 18-20 days to hatch hope this helps
I've had some chicks hatch on the 23rd day and plenty of them hatch before 21 days because they were bantams.
I put 60 in the hatcher this morning at 10:30 that are supposed to hatch Wed 5/18/11 and there were some already pipping . these are just a barnyard mixture from my pens but no bantoms all heavy chickens
coturix quail hatch 16-19 days here my seramas 18 -20 days the LF i have hatched are normally 18-20 days if they take too long some times your thermometer is wrong and it is too cold in your bator