Adventurer Nick Hancock is attempting to live alone for 60 days on an rocky islet described as one of the most inhospitable places on earth to raise money for Help for Heroes.
Hancock, from Ratho near Edinburgh, has spent the past 29 days living in a converted water tank attached to Rockall.
The uninhabited remote granite islet is roughly 270 miles off the coast of Ireland and 290 from Scotland. The nearest inhabited island is in the Scottish Outer Hebrides.
The record attempt has been threatened by treacherous weather conditions, as the waves washed away four barrels of supplies in a storm earlier this week which lasted several hours.
The record for a solo occupation of Rockall is 40 days set by Tom McClean in 1995, and the record for longest stay was set by Greenpeace, who lasted 42 days in 1997.
ITV News Reporter Richard Pallot reports.