I am John Manning, the runner (and as of 31 December 2008 formerly the PricewaterhouseCoopers Tax and Sustainability partner). As a small post-retirement challenge I will be attempting the Wessex 100 in May 2009, a non-stop (save for eating) 100 mile run. If I complete it, it will take about 32 hours.
Stop Press!! I did completed it in 29 hours and 6 minutes. It was exhausting and a great experience in equal measure.