First duck hatch
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Incubator temperature should be more like 99.5 F, so if it has been that low that might be why they are late in hatching. Lower temps will delay hatch times.
If you are hearing them peep, they are internally pipped and should mean you will see ducklings in the next couple of days. Ducklings take their time hatching, so be patient! You should see some external pips about 24 hours after they have internally pipped. Then they will rest again and should start hatching the rest of the way out after about another day.
Great to hear one is externally pipped! How is she doing today? Making progress? Any others doing anything yet?
You won't want to open the incubator to check on the others while the first one is externally pipped (will drop your humidity fast and possibly shrink wrap her), so you'll just have to wait patiently for any signs that the others are working in there as well.
That's great! How are they all doing now?