From Wikipedia, re Field Marshal Smuts:
At Stellenbosch, he learned High Dutch, German, and Ancient Greek, and immersed himself further in literature, the classics, and Bible studies. His deeply traditional upbringing and serious outlook led to social isolation from his peers. However, he made outstanding academic progress, graduating in 1891 with double First-class honours in Literature and Science. During his last years at Stellenbosch, Smuts began to cast off some of his shyness and reserve, and it was at this time that he met Isie Krige, whom he was later to marry.
On graduation from Victoria College, Smuts won the Ebden scholarship for overseas study. He decided travel to the United Kingdom to read law at Christ's College, Cambridge. Smuts found it difficult to settle at Cambridge; he felt homesick and isolated by his age and different upbringing from the English undergraduates. Worries over money also contributed to his unhappiness, as his scholarship was insufficient to cover his university expenses. He confided these worries to a friend from Victoria College, Professor JI Marais. In reply, Professor Marais enclosed a cheque for a substantial sum, by way of loan, urging Smuts not to hesitate to approach him should he ever find himself in need.[2] Thanks to Marais, Smuts financial standing was secure. He gradually began to enter more into the social aspects of the university, although he retained his single-minded dedication to his studies.
During his time in Cambridge, he found time to study a diverse number of subjects in addition to law; he wrote a book, Walt Whitman: A Study in the Evolution of Personality, although it was unpublished. The thoughts behind this book laid the foundation for Smuts' later wide-ranging philosophy of holism.
Smuts graduated in 1893 with a double First. Over the previous two years, he had been the recipient of numerous academic prizes and accolades, including the coveted George Long prize in Roman Law and Jurisprudence.[3] One of his tutors, Professor Maitland, described Smuts as the most brilliant student he had ever met.[4] Lord Todd, the Master of Christ's College said in 1970 that "in 500 years of the College's history, of all its members, past and present, three had been truly outstanding: John Milton, Charles Darwin and Jan Smuts" [5]
Looks like two years to me.