No idea about numbers of bees entering and leaving; that would depend on the strength of your hive and it's going to vary over the season. Mebbe someone else has a handle on this.
I have heard of people weighing their hives and seeing the weight increase 10-15 pounds per DAY during a strong flow. Sounds fun, but I haven't figured out how to easily weigh hives yet.. but I'm working on it.
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