The DIY methods for unfreezing or thawing the pipes get the water flowing again in 30-40 minutes. Some people might be tempted to wait for the pipes to thaw out by themselves. However, it depends on the weather, and the process can sometimes take days. The pipes typically don’t freeze until the temperature dips to 20 degrees Fahrenheit. However, the time varies depending on how long the pipes have been frozen and where they’re located actually.