Average handle time (AHT) Definition: The total amount of work time related to calls, including average talk time (ATT) and average after call work time (ACW), divided by the number of calls handled. Application: AHT is the total average amount of time a CSR spends talking and in post call work in relation to a call. Comprised of ATT and ACW. Tips about using average handle time as a call center metric: AHT is a metric which can be monitored or measured at a CSR, center or enterprise level. Similar to ATT, AHT can be easily manipulated so caution is given to how this metric is monitored or measured.