Peat moss is the most common medium used to incubate killifish eggs. The incubation time varies with different species but it should be quite safe to assume that eggs of the Nothobranchius will hatch in 6 to 8 weeks when kept at 29 degrees Centigrade.
The peat should always be stored in a dark and cool place. A styrofoam box is best because it will keep the temperature constant. But it's also okay to keep the eggs inside a bedroom drawer. Eyed-up eggs are a sure indication that the eggs are fully developed.
When you are ready to hatch the eggs, do not separate them from the peat when you wet them. For reasons which are not fully understood, the eggs won't hatch without the peat.
When "eyes" appear in the eggs, it would mean it's "wetting time". But even if you cannot spot the eyes, it's okay to wet the peat if you think the eggs are fully developed.
No harm will come to undeveloped eggs subjected to repeated wetting so long as you dry and bag the pea ...