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But you can use the overage on HBD on only one hive and the final effect is not much:)

Maybe, all I know is that I got more Hive than I usually get for a smaller amount of HBD than I usually swap.

But when you swap, it takes 3.5 days, right ? And if the price changes, that would take effect ?

Nah, I just used the Hive internal market. I didn't do a conversion. https://hivehub.dev/market/swap