The time it takes for soda to become completely cold in a fridge can vary depending on a few factors, such as the initial temperature of the soda, the temperature setting of the refrigerator, the efficiency of the fridge, and the surrounding environment. Generally, though, if the refrigerator is set to the recommended temperature of around 35-38°F (1.7-3.3°C), it should take approximately 1 to 3 hours for the soda to become cold.
If the soda is already at room temperature (around 70°F or 21°C) when placed in the fridge, it will cool down more quickly than if it were at a higher temperature. Additionally, if the fridge is relatively empty with ample space for air circulation, the cooling process will be more efficient. On the other hand, if the refrigerator is heavily stocked or if it's opened frequently, it may take a bit longer for the soda to cool down.
To expedite the cooling process, you can place the soda cans or bottles in the freezer for a short time before transferring them to the fridge. However, be cautious not to forget them in the freezer, as they could freeze and potentially explode.
Remember that carbonated drinks like soda can also lose some of their carbonation when stored for extended periods in the fridge, even if the temperature is cold enough. For optimal taste and fizziness, it's best to consume the soda within a few days after refrigerating it.