How log would it take an exposed pipe to freeze at 25 degrees?

The time it takes for an exposed pipe to freeze at 25 degrees Fahrenheit depends on several factors, including the pipe material, water flow, wind chill, and insulation. Generally, uninsulated pipes can begin to freeze within a few hours under these conditions, especially if there is a significant wind chill. In still air, it may take longer, but with temperatures consistently at or below 25°F, freezing is likely within 6 to 12 hours. Regular monitoring and insulation can help prevent this issue.