They may not be fertile or the conditions in the incubtor are wrong. Humidity needs to be higher when hatching duck eggs - refer to the incubator booklet/specifications for each type of egg. Most ducks I have reared usually pip at around 30 days and 2 days later they will emerge, however it is longer for muscovy ducks.
Being hybrids makes it difficult to determine hatching time as muscovys can take approx 35 days. Be patient. Don't open them as the duckling will still have the yolk attached and you can introduce infection resulting in death of the duckling.
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