We make it a habit of keeping our sauce no more than 5-days. Because the sauce is made in an environment where yeast is present, yeast contamination is going to be the most common issue and is evidenced by a slight bubbling of the sauce. The natural acidity of the sauce will help to keep things pretty well in check for up to 5-days, but after that you're on your own.
Tom Lehmann/The Dough Doctor