You have 12 laying hens about a yrold just got 8 baby ducks when will it be good to put in with chickens?

It is generally not recommended to keep chickens and ducks together, as they have different care and housing requirements. Chickens and ducks have different nutritional needs, and ducks require a water source for swimming and bathing, which can be a hazard to chickens. Additionally, ducks can carry diseases that can be harmful to chickens. If you do choose to keep chickens and ducks together, it is important to provide separate housing and feeding areas, and to monitor them closely for any signs of illness or aggression.