If done just before the main flow, would there be enough brood to make the most of the flow? As for drone numbers, I am thinking that some drone comb might be able to artificially raise drone numbers at different times of the year until the workers get to the point of kicking them out of the hive. As far as eggs go, how many would you say is necessary to guarantee emergency queens be made? As for food, I would imagine anytime near either flow should be good, right?
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24 to 25 days for a emergency to be raised to start laying. When eggs are laid,42 days till bees are foraging. Guess you better know when the flow is,the overlap could kill any chanced for a good honey crop unless there is an awful bunch of brood before the pinching. Another example of why a mated queen is better.