For Ginjō styles of sake, how many days do they stay fresh after opening?

Ginjō styles of sake, known for their delicate and fruity flavors, typically maintain their freshness for about a week after opening. This period allows consumers to enjoy the nuanced aromas and flavors that make Ginjō sake appealing. Beyond a week, oxidation and exposure to air may begin to change the taste profile, leading to a decline in quality.

Choosing a timeframe of one week aligns with storage practices where the opened bottles should ideally be kept in a cool, dark place to prolong the sake's quality. Other durations would suggest a different understanding of how sake interacts with oxygen once the bottle is opened, which would not be consistent with traditional assessments of sake shelf life after opening.