The freezing time of a liquid can be influenced by various factors such as the initial temperature, container material, container shape, and freezer conditions. While it is challenging to provide an exact answer without precise data and specific conditions, I can give you a rough estimate.
Assuming the can of beer is made of aluminum and the freezer is set to a constant temperature of 28 degrees Fahrenheit (-2.2 degrees Celsius), and the beer starts at 72 degrees Fahrenheit (22.2 degrees Celsius), here's an approximate estimation:
The exact freezing time will depend on the factors mentioned above, but as a rough estimate, it may take anywhere from 45 minutes to 2 hours for a 12-ounce can of beer to freeze in a freezer at 28 degrees Fahrenheit (-2.2 degrees Celsius).
It's worth noting that the time might vary depending on the efficiency of the freezer, the proximity of the can to the cooling elements, and the specific characteristics of the beer, such as alcohol content or carbonation.