Bank of Japan Gov. Haruhiko Kuroda has become the second-longest serving head of the central bank, a post he took in 2013 with a pledge to achieve 2% inflation through drastic monetary easing steps dubbed the "Kuroda bazooka."

But with Kuroda's term set to end in April 2023, delivering on his promise of hitting the inflation target may be much harder than setting a new record as the longest-serving chief in the central bank's history dating back to 1882.

Kuroda passed Masamichi Yamagiwa, who was BOJ governor from November 1956 to December 1964, for second on the list, with Kuroda's service time reaching 2,941 days on Wednesday.