I started a sour dough starter yesterday! It will take about a week for it to start being about right but to get really tart it will take maybe a month or more. If I can keep it going it will last for years. Life gets in my way and I end up losing the starter. Women who were stuck in wagon trains for months carried starter with them. They dipped clean muslin squares in the starter and let dry. Kept them wrapped in clean muslin and used when needed. They made biscuits. Sourdough biscuits are so good!