This attribute specifies the length of the accounting peak water mark
interval. It is at least one minute and at most 15 minutes long. An
accounting peak water mark within a given accounting interval is
the accounting count which occured during a peak water mark
interval with the highest traffic. Peak water marks are used to
determine traffic bursts. If no value is provisioned for this attribute
value of 5 minutes is assumed. Peak water mark is only measured if
attribute collectionTimes in Collector/account is provisioned.