How long does it take for the fizz to go away in soda?

The fizz in soda generally begins to diminish within minutes after opening the bottle or can, as carbon dioxide escapes. Depending on factors like temperature and how often the container is opened, it may take several hours for the carbonation to significantly decrease. However, if left open, most sodas can lose their fizz completely within one to three days. Storing them in the refrigerator and keeping the container sealed can help maintain carbonation longer.