I just had a split wait 3 days before starting QCs. Not till the 4th day did I see any. Got me thinking. Just how old are the larva that the bees choose? It is not unusual for them to have starts spread over different days. Do they actually use different ages? Studies or opinions?
Backing into the age by the calendar would indicate day to day and a half old larva is acceptable to the bees. At least, if I wait to harvest cells by the calendar I find destroyed cells.