How long does a soda fizz after its been opened?

The fizz in a soda typically lasts for about 30 minutes to 1 hour after opening, depending on factors like the type of soda, temperature, and how much it's agitated. Once opened, carbon dioxide begins to escape, leading to a decrease in carbonation. To maintain fizz longer, it's best to keep the soda refrigerated and minimize exposure to air. However, after a few hours, the soda may lose most of its carbonation and taste flat.