And even the corrected reading can be off. I only use my refractometer pre-fermentation. Never have been able to get an accurate reading post fermentation.
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What it all boils down to is wait for the wort to foam up and drop back into itself. That's the hot break. I won't add hops until then. Boiling purposefully longer than that isn't necessary IMO. Unless you have a specific reason like a boil-down like I did with the BW. That was a triple sparge and a large grain-bill and would have produced 20 gallons of regular beer.