Theres an annual fundraiser for Macmillans (UK cancer charity) called the Longest Day Golf Challenge. 72 holes in one day (on the longest day of the year). Never done it, but its on my list of things to do....
http://www.macmillan.org.uk/Fundraising/Golfevents/LongestDayGolf/HowTheChallengeWorks.aspx
Anyone fancy it for 2010 ?