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It’s likely the interviewer is meeting with several potential candidates, so their memory of your interview may fade over time. They’re more likely to remember you and what you talked about during your interview if you thank them within one day of your interview.  Wait at least an hour after your interview before sending your thank you note. Otherwise, you might seem too aggressive. If you’re sending a handwritten thank you note, deliver it in person or mail it on the day of your interview. Treat your thank you note as a business communication. Write your sentences using proper grammar, and avoid using slang or text-speak.  You might cost yourself the job if you use informal language like slang or text-speak. For example, avoid using abbreviations like "lol," "fwiw," and "rn." Similarly, don't begin your email with salutations like "hey" or "hi." Always use "dear" when you're writing a professional message. As you proofread your letter, check for words used incorrectly, such as "there," "their" and "they're." While you always want to come across as professional, your tone can range from formal to casual. You want to show your interviewer that you’ll fit into the company culture, so use the tone they set at the interview. For example, let’s say you interviewed with a modern tech company that boasts about its friendly, down-to-earth culture. If the interview process has been informal, you might use a more casual tone in your thank you note. You don’t want to waste the interviewer’s valuable time, so don’t elaborate too much. Be specific and direct in your statements. Your paragraphs will be very short. It’s normal for them to be 1-4 sentences long. You may learn personal information about your interviewer from a Google search or their social media accounts. Don’t include this information in your note, as doing so will likely make them uncomfortable. This behavior could make you look like a stalker, even if you’re just trying to ensure you’re the right fit for the job.  For example, you might have learned from their Linkedin profile that they graduated from the same program as you. It’s best not to mention this unless it came up during your interview. You don’t need to include personal details at all, so you might choose to stay away from this type of information. Read over the note at least twice to check for typos and other errors. If you can, ask someone else to read over it, as well. Fix any errors before you send the note. Typos or incorrectly used words might cost you the job, as the interviewer might view them as inattention to detail.
Send your thank you note within 24 hours of your interview. Use professional language throughout your thank you note. Match the tone of your interview. Keep your message concise rather than overly wordy. Stick to personal details discussed during the interview. Proofread your thank you note carefully before sending it.