The Welsh Three Peaks Challenge involves climbing Snowdon, Cadair Idris and Pen y Fan in the same day, either over 24 or 12 hours.
Solo walker, although was due to attempt all on the 8th September as a group from work, but cancelled due to weather forecast. I was on leave on the Friday so decided to go anyway and do 2 on the Friday, then complete the 3rd Saturday morning
23 hours 47 minutes