Can you give me an idea of the average time from taking the Foreign Service Officer Test to completing the whole process (Officer Assessment, minimum medical qualification, security clearance, and final suitability review)?

Assuming no serious security or medical issues arise, candidates who take the Foreign Service Officer Test can expect that the minimum time from the test date to placement on the register will be about eighteen months, but it can be months longer. Timing for Foreign Service Specialist positions is similar but varies by category. Offers to those on the hiring register will depend on budget and hiring authority for the Foreign Service Generalist and Specialist positions.