The number of previous 15-minute intervals for which data was collected. An agent with TDM capability must be capable of supporting at least n intervals. The minimum value of n is 4. The default of n is 32 and the maximum value of n is 96. The value will be n unless the measurement was (re-) started within the last (n*15) minutes, in which case, the value will be the number of complete 15-minute intervals for which the agent has at least some data. In certain cases (e.g., in the case where the agent is a proxy), it is possible that some intervals are unavailable. In this case, this interval is the maximum interval number for which data is available.