How many large eggs can a bantam hatch?

[stone_family3]

My bantam Duchess (dutch bantam) Can cover about 6 eggs if she tries hard

 

[chick123600]

I have a banty that tried to lay on 14 eggs, they were guinea and large chicken eggs. She had them completely covered. But then we bought a small chick and she thought it was hers and stopped laying on them, they are now in the bator.