Originally Posted by Lando
Thanks for all the input, but why plan to do a 90 min boil? I thought this was mainly used for driving off DME from pilsner malts?
You're going to be mashing with 6 gallons of water, plus whatever (likely high amount) you need to get to your recipe's planned 75% efficiency.
You'll end up with 9+ gallons in the kettle, so you'll need a long boil. This is a good thing with barleywines, as you'll get some awesome kettle carmelization and melanoidin flavors.