From what I've read (correct me if i'm wrong)
The point of a yeast starter is to give the yeast a weak gravity solution (1L water to 100G DME) to feast and grow on. For Saccharomyces, a lightly covered flask with a stir plate is best to both a) keep the yeast agitated and b) to oxygenate the yeast, which puts them in a reproductive aerobic phase.
My question: How long is too long to leave on a stir plate before pitching?
More specifically - If i have some lacto that i added to a starter on Monday and I'm waiting on a ph meter to come in the mail thats supposed to get here on wednesday next week, is that too long? Should I add some apple juice or dme so that it has something to eat?