This read-only integer reports the gateway-wide cumulative time spent on fax traffic over the current Traffic Stats interval, aggregating the per-port totalFaxUsage figures. Admins use it to see what share of overall gateway capacity is being consumed by fax rather than voice or data traffic. For example, an unexpectedly large totalFaxTime relative to overall traffic on a gateway believed to carry mostly voice would prompt investigation into why so much fax traffic is present.