Generally, mustard has a pretty long shelf life when stored properly. But, if you're wondering how long it will last, the answer is - it depends on the type and storage conditions. If you're storing it in a cool, dry place, it can last for up to a year, but if you refrigerate it, it can last even longer.
So, why do some people refrigerate their mustard in the first place? Is it because they want to keep it fresh, or is it just a habit? The truth is, mustard can be a bit like a fine wine - it can actually improve with age, but only if it's stored correctly. And, just like wine, it's all about finding the perfect balance between flavor and preservation.