IT doesn't take any longer to do 10 gallons ag then to do 5. I use 2 6.5 carbouys for fermentation. I put different yeasts in them also will dry hop 1 to see what happens. Used licroice root in a stout 1 time made it interesting. I did a barley wine only did 5 gallons of it put made a light beer with second runnings. It's a great way to play.