According to Official Guinness Records,
The longest distance sailed non-stop by any vessel is 71,023 nautical miles (131,535 km;81,732 miles), a feat achieved by Australian Jon Sanders between 25 May 1986 and 13 March 1988. Starting and finishing in Fremantle, Western Australia, Jon made a record three consecutive non-stop solo circumnavigations of the globe – one west and two east – and was at sea for a total of 657 days on his 13.9-m (44-ft) sloop Parry Endeavour.
For a complete list of 1988 records, please visit 1988 Guinness Records in Australia.