Hatchability can be seriously damaged by holding eggs at temperatures
above 65° or below 35° F. It is most important to hold eggs in a room
that can be kept below 65°, preferably between 50° and 60°. Eggs should
be collected several times daily and held on their sides or on the small
end. It is best to turn eggs gently once daily while they are being held
for hatching, but this is probably not necessary unless they are to be
kept longer than a week. For best results they should not be held longer
than 10 days but if they are held at a suitable temperature and are
turned once a day, fair hatchability will be retained for as long as 3
weeks.