Final answer:
A concurrent report typically covers an average time of forty-five days, but the actual duration may vary. Without additional context, it's difficult to ascertain the maximum period, but it might cover up to a couple of months.
Step-by-step explanation:
Based on the historical context provided, where the reported average time is forty-five days, and considering that other durations are also given which may vary, it is complex to determine an exact period covered by such reports without additional context. However, if an average time is considered as a basis, then it is reasonable to assume that a concurrent report could potentially cover up to a couple of months, although this would not be typical or certain given the standard forty-five-day reference point.