Final answer:
The time frame for a reporting senior to submit supplementary material after a performance report's end date varies by organization and specific policies. Without context, it is not possible to give a definitive answer.
Step-by-step explanation:
The question pertains to the time frame within which a reporting senior may submit supplementary material after the ending date of a performance report. This is typically a question related to military or corporate performance evaluations. The specific time allowed for submitting supplementary material can vary depending on the organization's guidelines. However, in the absence of a specified context such as the military or a particular corporate policy, it is not possible to provide a universally applicable number of years. Organizations usually have specific regulations that detail the process and time limits for submitting such material.