if you set the eggs a week apart then they should hatch about the same time based on my readings the chickens hatch in 21 days and ducks in about 28 we are also thinking about hatching ducks and chickens in the same incubator at the same time the temps are the same along with humidity the only difference I have found so far is that chicken eggs should not get wet and duck eggs can be misted with 100F water in the last few days to help the hatching process.I am not a expert this would be our first time as well this is strictly what I have read!
