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I'm starting 10 gallon batches soon..Anything special I need to know before I start? I'm gonna double my recipes and water volumes. One thing I'm wondering is when I do 5 gallon batches, I usually come out of my mash tun with 7 to 7.5 gallons of wort, boiling down to 5.5 gallons. I'm assuming for a 10 gallon batch, I'll need 14 gallons of wort. It takes me 90 minutes to boil down a 1 1/2 gallons. Now with the double batch, do I need to expect 3 hours of boil time?