What you need to establish is these two variables
1) Queue Length
If the queue looks too long, then a lot of people will leave. Often they will just come in the shop, look at the line and walk straight out. We do have specialised counters if you like to measure this or if you prefer just now and then do a head count. In this case, there are nine people in the queue
One trick you may want to consider is splitting the line into two, that way when people come in, they will see a queue of half size.
2) Average Wait Time
If people are waiting too long, often they will just walk out.
If you go to "find transactions" and call up everyone what you will get is something like this.
Showing you the dates and times that transactions are being processed. The average processing time is here a rate of just under 3 seconds a transaction using our system. So you cannot blame the operator for the length of the queue.
The Average wait time = (Average number of people in the queue which you got for (1) above ) x (average processing time from (2) above)
So the average wait time here is 9 x 3 = 27 seconds.
