When does the 21 days start?

[GlassesGirl]

I just got some Silkie eggs & i am wondering when we start the 21 day count. The day the eggs were layed or from when we put them in the incubator. I have the dates of all of them as to when they were layed. Thanks!

 

[sourland]

The 21 day incubation period starts when they are put in the incubator.