The best time to requeen is in a honeyflow, while the fieldworkers are out on a sunny day and the hive has been queenless for 24 hrs. A day or 2 of settled weather aftewards is good too. I like slender queen cages without attendants (attendants cause more issues than they solve) and in between frames with lots of eggs(means plenty of nurse bees). Use minimal smoke and disturbance let the bees do the rest. Don't bother em for 7 days afterwards as they will often ball the queen and injure or kill her.
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