What is the meaning of the phrase "in a timely manner"? What are some examples of it being used?

“In a timely manner” is often used as a polite request to do something as soon as you can. Actually the person requesting feels that “time is of the essence!” Time is the important aspect here. It is not quite as urgent as “ASAP,” but the requestor implies not to let too much time pass before completing the task. “Please fill out this application form and return it “in a timely manner.” I have also seen the phrase used, masking a hint of sarcasm or frustration towards a person who has not responded quickly enough.