Planning on brewing 2 batches this weekend and been working on 2 starters. Only have one stir plate though. I'm doing 2 stages for the starters, and the one on the stir plate went as planned. The one that I am shaking went well for the first starter, then the second was very active the first maybe 4 hours and has not done much since. Is it possible that it reached krausen in those first 4 hours since it was already fairly active from the first starter? Or should I give it more time? It's been about 30 hours and seeing no signs of further fermentation. Just tossed it on the stir plate and still nothing.