Be direct and to the point and, in the first sentence, acknowledge the receipt of their letter of resignation and formally accept it. The recommended timeline for providing a resignation letter is at least two weeks prior to your planned last day.A sample form to document an employee's verbal resignation. First, it may help to understand why a twoweek notice period is typical. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline.