Rachel, you would keep feeding every 12 hours, but without discarding. You'd do this until you had enough for your recipe, plus enough leftover to maintain in your starter container. So you'll need to do a bit of math and figure out when to stop discarding so that your starter will be bulked up and active when you're ready to bake. We don't think you'll run into many opportunities to use three cups of starter for most home recipes, though, so it usually only takes a day or two to get enough. Happy baking! Kat@KAF

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