So I just bottled my barleywine. It's been in the primary for just over a month, and it has CRAZY yeast activity the first week. That said, there wasn't too much blowoff (maybe 1/4 gallon MAX). 6 gallons went into the fermenter easy, and when I bottled today, I siphoned 5 gallons of beer off the yeast cake.
So... is it typical to lose 10%+ of the liquid in a batch due to the yeast cake liquid? When I make 5.5 gallons of whatever, I invariably end up bottling 4.5 gallons. Sealed fermenters... so I dunno where it's all going.