Ace, good day Sir, to answer your question ?of how long?? If the queen is laying, Then I consider it CONFIRMATION, good to remove excluder, usually only a few days. Now I only have experience with packages, not with wild caught, or removals, but I would think the egg laying as a rule, would prevail.
Off subject, with a swarm trap, if the bees are bringing in pollen, that also is to me, CONFIRMATION that the bees have accepted the trap as their new home.
Blessings