This read-only integer reports how many seconds have elapsed since any object in the Traffic Stats group was last polled, giving admins the actual sampling window over which the accompanying counters, like totalIngressCount and totalEgressCount, accumulated. It's essential for converting the raw cumulative counters into rate figures. For example, dividing totalIngressCount by totalInterval gives an admin the average ingress-call rate per second since the last poll, rather than just a running total with no time context.