22 hours at 37,6 C.
One “ice cube” of L. Reuteri 6475 in each jar, 12 liters in total.
16 hours usually work fine, but didn’t have 2 ice cubes for the 3 L jars so decided to let it cook for some extra time… bacteria count double about every third hour, so all jars will be more “sour” than at 16 h. especially the smaller 1 L. jars.