How long to swim round England?

Swimming around the entire coastline of mainland Great Britain would be an incredibly challenging and demanding feat, and the exact time it would take to complete would depend on a number of factors, including the swimmer's fitness, the weather conditions, and the route taken.

Several swimmers have attempted to swim around Great Britain, with varying degrees of success. Some have completed the swim in stages over several years, while others have attempted non-stop swims, taking breaks only for food and rest.

In 1988, British swimmer Roger Allsopp became the first person to complete a non-stop swim around the 1,920-mile (3,090-km) coastline of Great Britain. Allsopp's swim took 31 days and 16 hours, and he faced strong currents, jellyfish stings, and hypothermia during his journey.

In 2008, American swimmer Lynne Cox completed a non-stop swim around Great Britain in 30 days and 13 hours, breaking Allsopp's record. Cox encountered similar challenges to Allsopp, including cold water temperatures, strong currents, and jellyfish stings.

In recent years, there have been a number of successful attempts to swim around Great Britain in stages. In 2016, British swimmer Ian Botham completed the swim in 104 days, raising money for charity. Botham's swim took him around the entire coast of Great Britain, including the most challenging sections such as the Pentland Firth and the English Channel.

While the time it takes to swim around Great Britain can vary greatly depending on the individual swimmer, the weather conditions, and the route taken, it is typically a multi-week or even multi-month endeavor, requiring extreme physical fitness and mental resilience.