We had a nest in the Chicken house that a guinea was sitting on for weeks. throughout the time other hens kept adding eggs to the stack, then two, then three hens were on the nest. Suddenly they all ABANDONED the nest. we watched for TWO days. they just gave up. Wel l l l l....... I candled the eggs and most still had movement, and various stages of development, some had no development. I put everything that had ANY signs of movement, or no development at all into the incubators. We had guineas hach out every couple of days for about 4 weeks. Out of about 35+ eggs, only about 5 did not make it. some were weak, and we helped several out of the shell. Candled evey day and moved to the hatcher as we thought they were ready.
Sorry for the long answer to the easy question, but I would say your chances are good.
RobertH