I have 8 runner x australian spotted duck eggs & 1 lonely pure Australian spotted egg in the bator now but I know that batam duck breeds (especially calls I know for sure) have a shorter incubation period than other ducks. Some people lockdown 4 days before hatch with regular ducks and some do 3 days. I think most bantams incubation period is 26-27 days instead of 28 but if the other 8 eggs have a australian spotted father, so will those also hatch sooner than 28 days? So my question is when should I lockdown? Please help!