State your resignation and provide the effective date. A common misconception is that two weeks' notice is a legal requirement.There is no federal or Arizona law that makes this a requirement. I am writing to inform you that I have made the difficult decision to resign from my position at Phoenix Realtors. Are you getting ready to leave your job? Here's how to write a professional two weeks' notice resignation letter, with examples. 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. A short resignation letter is the way to go. Include your name, position, the date of resignation and the intended last day of work in the first paragraph.