I installed two packages of bees three weeks ago Monday and released the queens on Thursday (neither one had made it out). So it wwould have been at least Thursday before they could start laying. Yesterday, three weeks from the day of installation, there were a lot more bees showing up in one of the hives. Everything I've read said that it takes 20-21 days for worker bees to reach maturity so i should not see new bees until Thursday or Friday this week at the earliest. The number of bees in the other one still looks the same but it's hard to tell. I have an observation window so it's easy to see the bees without going into the hive. Would some of them have decided to move over to a different hive (only a few yards away) after three weeks?