How many times should you repeat a test for it to be valid?

The number of times a test should be repeated for it to be considered valid depends on the test's nature and the required level of precision. Generally, repeating a test at least three times can help identify outliers and provide a more reliable average result. However, specific fields may have established guidelines that dictate the minimum number of repetitions for validity. Ultimately, the goal is to ensure consistency and reliability in the results obtained.