7.46 AM
Seriously no idea I just don't stare I my eggs, I put them in the incubator and forget about them until the date gets closer, at which time I check every other day and more often then not I cut anyway unless they bit me to it.
Even if they pip they will be fine in the incubator for 2 days, even if they were to pip now they might not get out of the eggs before another 2 to 5 days anyway.