How long can you keep opened cider before it goes bad?

Opened cider can generally be kept in the refrigerator for about 5 to 7 days before it starts to lose its flavor and carbonation. While it may still be safe to drink after this period, the taste and quality will likely diminish. Always check for any off smells or unusual changes in appearance before consuming. For the best experience, it's recommended to consume opened cider as soon as possible.