You want to give at least a two weeks' notice. Know how to write a two weeks notice letter?Check out our guide, complete with examples and learn everything you need to know. This guide provides 20 professional 2week notice templates that are easy to personalize in Word. Each template has a different tone and style. When To Provide a Resignation Letter. The recommended timeline for providing a resignation letter is at least two weeks prior to your planned last day. The shorter the letter, the better. In this article, we discuss what a retail resignation letter is, the key parts you should include in the letter and the steps to writing one. Start with a two weeks notice letter.