Final answer:
Without specific jurisdiction or context, it's impossible to determine the minimum duration required for keeping leak testing records. The regulations vary across regions and industries, and one must consult local regulations or EPA guidelines for accurate information.
Step-by-step explanation:
The duration for which leak testing records must be kept can vary depending on the regulations that are being referenced. However, without any specification of the jurisdiction or the context in which these records are required (such as refrigeration and air conditioning, natural gas pipelines, etc.), it is not possible to accurately determine the minimum duration required for keeping these records. As practices and requirements differ across regions and industries, it is essential to consult the specific local regulations or the Environmental Protection Agency (EPA) guidelines, which often govern the duration for record retention for leak testing in different contexts. For example, under certain EPA regulations, there may be requirements to keep records for a specific period - like three years for some industrial equipment - but without this context, providing a definitive answer would be speculative.