The length of time it takes for water to develop a stale taste can vary depending on a number of factors, such as the temperature, the level of carbon dioxide in the air, and the type of container used to store the water. In general, water that has been exposed to air for several days or longer may start to taste stale or flat.

Regarding the amount of carbon dioxide that can dissolve in water, there is a limit to how much can dissolve in a given volume of water at a given temperature and pressure. Once the water has reached its maximum capacity for dissolved carbon dioxide, any additional carbon dioxide in the air will not dissolve and will instead remain in the air space above the water. This is why the taste of water can change over time, even if the bottle or container remains sealed, as the carbon dioxide in the air space above the water can still interact with the water and affect its taste.
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