How Long Mayo Will Still Taste Good After Opening - Chowhound

Along with making sure you're eating store-bought mayonnaise within a two-month timeframe after opening it is also important to consider your mayonnaise's "best by" date when determining whether or not to reach for the jar. If your jar is past this date, it is probably best to toss it. For homemade mayonnaise, the shelf life is much shorter, as it doesn't contain the same preservatives as commercially produced…