The National Party's longest-serving leader has been Sidney Holland (17 years), followed by Keith Holyoake (14.5 years). Todd Muller has been leader for the shortest period (53 days). By July 2020, eight of National's 14 leaders had served as prime minister. National's longest-serving prime minister has been Keith Holyoake (12.5 years), while his successor, Jack Marshall, and Bill English were both prime minister for just 10 months.
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Source: New Zealand National Party