J-Lo had 9!
When we thought she went broody, we gave her 8 of the eggs she and the other girls had been laying. She laid another one the next day herself. All 9 of them were successfully hatched.
Of special note, one of our layers that was stolen along with Magic, the largest rooster in Narok, was Cleo. Cleo was an all black bird. As you can see, five of these chicks are all black.