Think this depends how prolific the queen is and the swarming urgency of the colony. I had one colony last year where I did a Demaree moving all the brood to the top box and putting drawn comb and a bit of foundation in the bottom. Queen zipped along, foundation was drawn and filled v quickly with brood, before the brood had emerged from the top box; they swarmed within 2 weeks from the bottom box. There were no queen / swarm cells, just cups with no eggs in when I started the Demaree. Can only conclude swarming intentions were close to being initiated when I started the Demaree.Put supers on top....oops
No need to inspect bottom box
The other colony I tried it on worked a dream, 2 nice supercedure type cells in the top box and colony didn’t swarm for the rest of the season. Need to try on more this year and think I’ll keep an eye on the bottom box, though I’d prefer not to!