Four friends doing the National Three Peaks challenge to raise money for Cancer Research UK. https://www.justgiving.com/page/three-peaks-challenge-?utm_source=copyLink&utm_medium=one_page&utm_content=page/three-peaks-challenge-&utm_campaign=pfp-share&utm_term=9599a4bf1c2a4d0485194a1640773fe1
23 hours and 45 minutes
The National Three Peaks Challenge takes in the highest mountains in Scotland, England and Wales, often in 24 hours.