Table:
text: Governor-General of the Union of South Africa
List of governors-general of South Africa
List of governors-general of South Africa
_ Name_Birth_Death Took_office Left_office Monarch Prime_Minister_
1 The Viscount Gladstone , (1854–1930) 31 May 1910 8 September 1914 George V Botha
2 The Viscount Buxton , (1853–1934) 8 September 1914 17 November 1920 George V Botha
3 HRH Prince Arthur of Connaught , (1883–1938) 17 November 1920 21 January 1924 George V Smuts
4 The Earl of Athlone , (1874–1957) 21 January 1924 26 January 1931 George V Smuts
5 The Earl of Clarendon , (1877–1955) 26 January 1931 5 April 1937 George V Hertzog
6 Sir Patrick Duncan , (1870–1943) 5 April 1937 17 July 1943 George VI Hertzog

Question: Among the Governors-General of the Union of South Africa, how many governors did the Union of South Africa go through during the reign of George V?