I believe it was more like 619 days. But, yes, Jon Sanders' set the bar so high that there is no longer much interest in back to back non-stop circumnavigations. He is credited with:
First single-handed to complete five circumnavigations (two having been completed by Sanders in Perie Banou in 1981-82)
First single-handed to complete three non-stop circumnavigations consecutively.
First single-handed to complete a total of four non-stop circumnavigations (the first in 1981-82)
First single-handed to complete more than one non-stop circumnavigation.
First single-handed to complete five Cape Horn rounding's (one east-west, four west-east).
First single-handed to complete four Cape Horn rounding's during non-stop circumnavigations.
First single-handed to round the five southernmost capes four times.
First single-handed to complete a circumnavigation using the east-west route
(i.e. Cape Horn plus two other capes - Leeuwin and Good Hope).
First single-handed to complete four circumnavigations using the west-east route (i.e. Cape Horn plus four other capes - Good Hope, Leeuwin, South East, Tasmanian and Southwest, New Zealand).
First small yacht (less than 15.5m) skipper
to complete five circumnavigations, crewed or single-handed
Longest distance ever sailed continuously by any vessel (71,023 nautical miles or 131,535km).
Longest period ever spent alone at sea (657 days 21 hours 18 minutes).
Believed first yachtsman to complete five circumnavigations via Cape Horn (as crewed or single-handed).
First yachtsman to circumnavigate non-stop via the Horn west about and east about.
First yachtsman to complete three consecutive non-stop circumnavigations.