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Typically, it takes approximately 8 to 12 years of dedicated military service, along with consistent performance and leadership development, to be promoted to the rank of First Sergeant. The process involves progressing through various enlisted ranks, such as Sergeant and Staff Sergeant, while demonstrating exceptional leadership skills, technical proficiency, and a strong understanding of military protocols. Candidates must also complete specific professional development courses and often undergo evaluations and recommendations from their superiors. The timeline can vary depending on individual performance, available vacancies, and the needs of the service branch, but generally, reaching this senior non-commissioned officer position requires a combination of experience, dedication, and proven leadership ability over several years.