I'm still trying to find the right fermentation time and taste. I may have to see if time spent in the refrigerator actually stops (or stalls, or slows) fermentation, because all of my batches sat in the fridge after I stopped them by refrigeration, so they had 10-12 hours in there before meal time and I tried them (if that makes sense). Except for my short kefir mix episode with goat milk, all of my fridge time has been with loose covers (now I put a coffee filter molded around the top without a rubber band).