Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Please accept this letter as a notice of my resignation.These resignation letter templates would help you write yours in no time, and learn how generative AI can help too. I regret to inform you that, after much thought, I have decided to resign. Please accept this letter as a formal notice of my resignation. State your position on the day of resignation: Always mention the position you held in the office on your last working day. How Long Should Your 1-Month Notice Resignation Letter Be? Up to 150 words is good enough.