I started my starter for 1 pack of wy1098 last night around 8. Watching various video's, especially from Mr. Malty, it recommends that you stop the process around 18 hours. Others say let it go for 24. My little friends are still eating away just shy of 16 hours. I am stepping up from 100 Bill to 300 bill and want to make sure I don't miss any windows.