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If they all went in the same day then they should be close to the same time but there are always stragglers. But a chicken is a chicken as far as time for incubation. One thing that can affect hatch time is if you have warm areas in you bator instead of uniform temperature across. In the warm...

You'll need to wait until about 7-10 days to see anything of substance to determine fertility. Less than that and they haven't really had time to develop.