Question: Anthony Robinson was a friend of a prominent British Whig statesman whose parliamentary career spanned how many years?

Context articles: Charles James Fox
John Lambton, 1st Earl of Durham
Anthony Robinson (Unitarian)
Thomas Pelham-Holles, 1st Duke of Newcastle
Durham County, Western Australia
William Fitzwilliam, 4th Earl Fitzwilliam
William Windham
The Intrepid Fox
Granville Leveson-Gower, 1st Earl Granville
William Lamb, 2nd Viscount Melbourne

Charles James Fox (24 January 1749 – 13 September 1806), styled The Honourable from 1762, was a prominent British Whig statesman whose parliamentary career spanned 38 years of the late 18th and early 19th centuries and who was the arch-rival of William Pitt the Younger.
 His father Henry, a leading Whig of his day, had similarly been the great rival of Pitt's famous father.
 He rose to prominence in the House of Commons as a forceful and eloquent speaker with a notorious and colourful private life, though his opinions were rather conservative and conventional.
 However, with the coming of the American War of Independence and the influence of the Whig Edmund Burke, Fox's opinions evolved into some of the most radical ever to be aired in the Parliament of his era.
John George Lambton, 1st Earl of Durham, GCB, PC (12 April 1792 – 28 July 1840), also known as "Radical Jack" and commonly referred to in Canadian history texts simply as Lord Durham, was a British Whig statesman, colonial administrator, Governor General and high commissioner of British North America.
 He was a founding member and chairman of the New Zealand Company that played a key role in the colonisation of New Zealand.
Anthony Robinson (1762–1827) was an English Unitarian minister and friend of Charles James Fox.
Thomas Pelham-Holles, 1st Duke of Newcastle upon Tyne and 1st Duke of Newcastle-under-Lyme, (21 July 1693 – 17 November 1768) was a British Whig statesman, whose official life extended throughout the Whig supremacy of the 18th century.
 He is commonly known as the Duke of Newcastle.
Durham County was one of the 26 counties of Western Australia that were designated in 1829 as cadastral divisions.
 It was named after Baron Durham, a British Whig statesman.
 His father-in-law was Earl Grey (Grey County, Western Australia).
 It approximately corresponds to the north-eastern part of the Avon Land District which forms the basis for land titles in the area.
William Wentworth-Fitzwilliam, 4th Earl Fitzwilliam PC (30 May 1748 – 8 February 1833), styled Viscount Milton until 1756, was a British Whig statesman of the late 18th and early 19th centuries.
 In 1782 he inherited the estates of his uncle Charles Watson-Wentworth, 2nd Marquess of Rockingham, making him one of the richest people in Britain.
 He played a leading part in Whig politics until the 1820s.
William Windham PC, PC (Ire) (14 May [O.S. 3 May] 1750 – 4 June 1810) was a British Whig statesman.
 Elected to Parliament in 1784, Windham was attached to the remnants of the Rockinghamite faction of Whigs, whose members included his friends Charles James Fox and Edmund Burke.
 Windham soon became noted for his oratory in the House of Commons.
The Intrepid Fox was a pub at 97/99 Wardour Street, Soho, established in 1784 by the publican Samuel House, who named it after the prominent British Whig statesman Charles James Fox.
 The pub was located on the corner of Wardour Street and Peter Street.
Granville Leveson-Gower, 1st Earl Granville GCB PC (12 October 1773 – 8 January 1846), known as "Lord Granville Leveson-Gower" from 1786 to 1815, as "Viscount Granville" from 1815 to 1833, and as "Earl Granville" from 1833 onwards, was a British Whig statesman and diplomat from the Leveson-Gower family.
William Lamb, 2nd Viscount Melbourne, (15 March 1779 – 24 November 1848) was a British Whig statesman who served as Home Secretary (1830–1834) and Prime Minister (1834 and 1835–1841).
 He is best known for his intense and successful mentoring of Queen Victoria in the ways of politics, when she was between the ages of 18 and 21.
 Historians have concluded that Melbourne does not rank highly as a Prime Minister, for there were no great foreign wars or domestic issues to handle, he lacked major achievements, and he enunciated no grand principles.
 "But he was kind, honest and not self-seeking."
 Melbourne was dismissed by King William IV in 1834, the last Prime Minister of the UK to be dismissed by a monarch.