Just made my first batch of yogurt yesterday. I think it came out okay, but I would have liked it to be a bit more sour. I've heard the longer you leave yogurt out before you refrigerate it increases the sourness of the flavor. Does anyone know how long yogurt can be left to set before it starts to spoil?
An additional question would be if the starter yogurt (plain, greek, indian, etc.) has a strong effect on the eventual flavor of the finished product?