Take Paolo, a caller at a personal loan agency in Manila, working 200 enquiries between 9 am and 5 pm. Dialing by hand, each call cost him about 20 seconds before anyone answered: finding the row, typing the number, checking it.
Over 100 calls that is roughly 2,000 seconds, a little over half an hour on the keypad. With the auto dialer that time goes, and auto redial brings back the 40 or so numbers that did not answer the first time, twice more, without Paolo keeping a separate list.
Whether the saved half hour becomes ten extra conversations or twenty depends on how long his calls run, not on the dialer. The figures are arithmetic for illustration, not a promise of a daily total.
A worked illustration with round numbers, not a customer record.