Thank you for your assistance. Provides a formula for writing thank you letters after job interviews.Also discusses common errors and supplies several example letters. Scenario 2: An appreciation letter applauding an employee's leadership skills. The best practice for thank you timelines is 2 to 4 business days. The message of appreciation should stand alone. Be brief, warm, and sincere. Thanks for everything you have done to help us get the new school year started off right! Last year, for example, two out of three UHCL students received some kind of aid package. Information that was not discussed.