> If a swarm does not immediately leave the hive box, it has adopted it as
> a new home.
 
It's not at all uncommon, though, for such an apparently settled swarm to
leave again from their new home around dusk the same day -- unless
1.) there is a frame of open brood added or 2.) the hive is relocated at a
distant site (where they cannot navigate to continue on their planned
journey).
 
Allen