"It seems like the new kits (3 packages instead of two)turned yeastier sooner than the old kits.  My mother lasted almost a month with the old kits.   So, I followed directions to divide each envelop into 4 parts.  I only make 1 cup of mother and its so much less yeastier.  And it lasts 3 weeks, during which I make 3 second generation batches.  Much better and less expensive."