Our one and only banty, the best sitter we have, has only turned out 3 chicks of 8 eggs this time. One died for whatever reason, and 4 have hatched, which probably won't as the others are about 3 days now. She usually pumps out 7-8 chicks at a time, 2 times a year.
The full Buff Orpington won't hatch for a few more days.