A question about a recipe: Maple Balsamic Salad Dressing

The only ingredient in that recipe that would spoil quickly is the shallot. Since the dressing contains quite a few ingredients with preservative properties (vinegar, soy sauce, olive oil), the dressing will likely last a month or more without any issues.

Garlic + Oil = Danger Same issue with the shallot. 3-5 days, a week tops.

You can read more about the subject here:

http://umaine.edu/publications/4385e/