Expected wait time calculation system generates expected wait time value representing time duration expected to elapse before client is connected to a resource for servicing. Expected wait time calculation system includes interface to work force management system obtaining indication of quantity of resources available for servicing clients. Interface to queuing system obtains indicator of queue position of subject client. FIFO stores plural measured time intervals, each representing time period between successive resource queue decrement events. Measured time intervals are stored. Central tendency time interval calculator determines central tendency time interval by calculating a central measurement of a quantity of most recently measured time intervals from the FIFO by dividing a unit of time by the central tendency time interval. Expected wait time calculator determines expected wait time value as function of clients expected to be serviced prior to subject client times the central tendency time interval or divided by rate.
