How long does most sake stay fresh after opening?

Sake is a delicate product, and its freshness is highly influenced by exposure to air and storage conditions after opening. Typically, once a bottle of sake has been opened, it is best consumed within two weeks to enjoy its optimal flavor and aromas. During this time, the interplay of oxygen with the sake’s compounds can lead to slight changes, but it is still generally regarded as fresh and enjoyable.

After two weeks, the quality may begin to diminish, causing some loss in flavor and aroma. This is why the two-week timeframe is essential for keeping sake at its freshest post-opening. Sake should ideally be stored in a cool place, and, if possible, in the refrigerator to help preserve its qualities for the duration it will be consumed. Other durations mentioned do not align with the commonly accepted peak freshness period for opened sake, which is why they are less appropriate.