Step 1: Understanding the Question:
The question asks for the length of the term of office for the UN Secretary-General.
Step 2: Key Concept:
The Secretary-General is the chief administrative officer of the United Nations. They are appointed by the General Assembly upon the recommendation of the Security Council.
Step 3: Detailed Explanation:
The term of office for the Secretary-General of the United Nations is five years.
The term is also renewable. By convention, the Secretary-General is eligible for a second five-year term, and many have served two full terms.
Step 4: Final Answer
The tenure of the Secretary-General of the United Nations is 5 years.