Longest serving woman prime minister in the world?

As of October 2023, the longest-serving woman prime minister in the world is Sirimavo Bandaranaike of Sri Lanka. She served three terms as prime minister, first from 1960 to 1970, then from 1970 to 1977, and finally from 1990 to 2000, totaling over 17 years in office. Bandaranaike was the world's first female head of government when she first took office. Her leadership significantly influenced Sri Lanka's political landscape and women's representation in politics.