This is an intermediate post with a few ideas about trap outs. It will be followed by a post on checking and concluding a trap out sometime later. Fact....If one worker finds a way back in, she will lead the rest to that entrance. After that, they will continue to look for other entrances. It is nearly impossible to seal all entrances if it isn't done with the initial set up. Theory....I think the queen reacts as if there is a dearth when the foragers stop bringing in pollen and nectar. She quits laying. Therefore, my belief is that the last egg is laid within a week of the trap being set. That leaves a total of 4 weeks from set up, until the last worker emerges. As with everything about bees, this can vary. I have never seen a hive starve to death in the summer. I have seen them use up all stores in a dearth in the summer and abscond. Therefore, when a trap out runs out of stores, the queen and the remaining bees will abscond. The majority of the time she will pass the catch box and land on a bush in the area. From there, it is like a swarm. If you find her in time, they can be hived. If not, they follow the scouts. a trap on a newly arrived swarm will many times leave within the first 2 or 3 days. They have no brood, no stores, and no reason to stay in their new home. Many of these queens will take the catch box, many will not. a colony that has been established for quite some time will almost always leave the area, leaving only the bees that have taken up in the catch box prior to the departure. I have been told by beeks in heavy SHB areas that the SHB will devastate a colony before the trap out can be completed.If you have a problem with SHB in your area, you may want to do the trapouts in early spring before the SHB get strong.