On average, you typically have 20-45 seconds to impress the employer with your cover letter and resume. It is important to tailor your message to your audience and pay attention to detail in order to craft a well written cover letter. Your cover letter should describe your qualifications, personality, and excitement for the position. It is not necessary to repeat the information on your resume or curriculum vita. These documents should complement one another to capture an employer’s interest to grant you an interview.