The answer depends on:
Average time taken to serve one customer
Average number of customers requesting service per day {NB not the total customer base}
Average desired waiting time; i.e.,how long are the customers willing to wait without feeling delayed?
Type of queuing discipline you have.
Get these parameters and I will show you how to work it out.....better still,get in touch with me [contacts in my profile] and we do business together.....
Behind the gardens...Behind the wall...Under the tree (Including: Red...Dark Blue...Yellow)
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.