Jobs are updated within 60 days, and every posting leads to a direct employer.
Many employers interview dozens of applicants.
As a result, they may not remember you. Your thank you letter will refresh their memory of the interview, the key points you discussed, and will round out your profile as a top candidate for the position. After your interview, make notes about what the recruiter seemed most interested in and discussed in most detail. Use this information to write your thank you letter. By sending a thank you letter within 2 days of the interview, the prospective employer should receive it before a hiring decision has been finalized, and you'll have the benefit of putting yourself in front of the recruiter one more time.