Jordan, sourdough starter varies widely depending on how and where it's built; some becomes vigorous very quickly, some takes awhile. I'd say try using it today, and see what happens. If you're making a loaf without any added yeast, you'll quickly find out whether or not it's strong enough to raise bread on its own at this point; if your loaf includes yeast, then it will probably take care of most of the rise, and the starter can contribute its flavor without having to work too hard. let us know how it comes out - PJH

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