One common error is that you do not count the day you put the eggs into the incubator as day one..it is zero. after the first 24 hours it becomes day one. So if you put them in on the 1st day of the month day 13 would actually be the 14th of the month. and so on. Do not turn on day 13, which in...
average is 16-18 days but it can take as long as 21 days it depends on the temp and humidity. and also handling before incubation began.
just be sure to keep the humidity up to 55-65% one easy ways is to use wet sponges, I place them under the ventilation hole so I can re-wet them with a turkey...