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Typically, aspiring fire lieutenants need to accumulate a minimum of five years of active firefighting experience, during which they develop essential skills and leadership qualities. In addition to this experience, many fire departments require candidates to pass promotional exams that assess their knowledge of firefighting procedures, leadership abilities, and emergency management. Some states or departments may also mandate additional training programs or coursework to prepare candidates for supervisory roles. The exact timeline can vary depending on the department's policies, the candidate's performance, and the availability of promotional opportunities, but generally, it takes several years of dedicated service combined with successful testing and training to advance to the rank of fire lieutenant.