Hey, I try anything until I find whatever works. Lol! I've only caught one swarm and that was last month. Actually I forgot about them because when I checked they had robbed that location (where my hives are) too. I re baited it and forgot. I estimate that they were there about 2-3 weeks by the amount of cone. They are in my hive now and are doing ok. Mean suckers while they were in the trap.
We just got a new ordinance that allows bees where I live. This is where the new trap is. Maybe trying to catch a swarm of city bees is different. I'm looking into a high rise, skyscraper, Statue of Liberty type swarm trap. *wink!*