Explanation

Longest-Serving German Chancellors:

1. Otto von Bismarck – 22 years, 262 days
2. Helmut Kohl – 16 years, 26 days
3. Angela Merkel – 16 years, 16 days
4. Konrad Adenauer – 14 years, 31 days
5. Adolf Hitler – 12 years, 90 days