Swarm arriving at a bait hive on a garage roof
Below: as the front of the incoming swarm arrives, initially only scouts are at the bait hive entrance
Below: the first bees settle round the entrance and fan pheromone to attract the rest of the swarm
Below: the number of bees settling increases
Below: more bees have settled and the focus of the bees in the air is more concentrated round the bait hive
Below: very few bees still in the air; the swarm waits its turn to go in at the small entrance.
The total time between first bees arriving and the all the swarm entering the bait hive is henerally 15-30 minutes.
David Heaf's bee removals index