Most people in the Autosport office have taken in their fair share of 24-hour races over the years, although usually from the relative comfort and warmth of a media centre rather than the cockpit.
But just because we've sat through 24-hour races at Le Mans, Daytona, Spa, or even Silverstone, that doesn't mean we'd know how to go about competing in one of them.
With the Daytona 24 Hours about to kick off the international racing season, who better to ask than last year's Le Mans-winning driver line-up of Allan McNish, Tom Kristensen and Dindo Capello, with 13 victories in the great race between them?
In the end, what you need is the concentration - especially in the last stint. The first two stints are quite easy, but the last one, not physically but mentally, is more difficult. That is the only change I do in my schedule - something which allows me to concentrate even to the end of the race.
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Glenn Freeman is the editor of Autosport.com. After 10 years of karting, he decided that writing about motorsport would put less strain on his dad's bank balance than competing, and after obtaining his NCTJ qualifications in newspaper journalism, he joined Motorsport News in 2005.
As deputy racing editor, he covered British Formula 3 and selected international events. He also got the chance to take on boyhood hero Nigel Mansell in a kart race and beat the 1992 world champion.
Glenn left MN to become Autosport.com's international editor in September 2006 and joined the magazine's news desk in January 2008, spending six years as news editor. During that time he covered four seasons of DTM and a year of GP2/GP3, before switching to Formula Renault 3.5 from 2012-14. He became the website's editor in 2014.