Final answer:
The question lacks context and cannot be accurately answered without additional information regarding the industry, type of equipment, and governing standards. Typically, the extension of calibrations is managed by a quality control department or an external calibration service guided by specific regulations and standards.
Step-by-step explanation:
The question presented appears to be out of context and lacks specific details that would allow for an exact answer. If you are referring to the calibration of tools or equipment related to engineering, safety, or technical work, the authority to extend calibrations on non-safety calibrateable items usually lies with the organization's quality control department or an external calibration service provider. These bodies are guided by industry standards, manufacturers' recommendations, and regulatory requirements to determine the calibration intervals. However, without more context or detail regarding the industry, the type of equipment, or the governing standards, it is difficult to give a precise time frame for how long these items can be extended before recalibration is necessary. For a more accurate answer, please provide additional information regarding the context of the items in question.