Breakfast presenter Chris Moyles and sidekick Comedy Dave are to attempt to present Radio 1's longest ever show next month to raise money for Comic Relief.
They'll start the programme at 6.30am on Wednesday 16 March and aim to beat Simon Mayo's 37 hours in 1999.
Chris and Dave will be joined on air by the regular line-up co-presenting and the whole thing will be streamed live on the Radio 1 website and on the Red Button on digital TV.
The 'rules' say they have to be in every link, with no segues, but the pair will be allowed 5 minutes' break for every 60 minutes on air.
Chris says: "In 2009 I broke the record for being the longest-serving Breakfast DJ on Radio 1, so I thought, why not go for broadcasting the longest radio show on Radio 1 too! Of course I'm worried about what the lack of sleep will do to me, but the pain will be worth it if we can raise a fortune for Comic Relief."
Comedy Dave added: "I'd love to say I'm really excited about it, but every time we talk about the project I feel tired and start yawning!!"
Radio 1 Controller Andy Parfitt told us: "Last week Radio 1 listeners raised over £500,000 for Red Nose Day – once again our listeners have been amazingly generous. Time and time again they surpass our expectations and I know they'll get behind Chris and Dave as they embark on this amazing challenge."
Simon Mayo – who at the time was the midmorning presenter – [link=http://news.bbc.co.uk/1/hi/entertainment/295102.stm]managed 37 hours[/link]. Moyles said he was aiming to do "at least a minute more."
There have always been arguments about what the world's official longest radio show has been – with many UK presenters attempting it over recent years. Time 106.6's Mike Russell managed [link=http://www.worldrecordsacademy.org/society/longest_continual_broadcast_mike_russel_70182.htm]126 hours[/link] in 2007, although it's thought the current official record holder is German broadcaster [link=http://www.telegraph.co.uk/news/newstopics/howaboutthat/5114857/German-DJ-breaks-world-record-with-week-long-show.html]Dominik Schollmayer[/link] from Hit Radio Antenne in Hanover who stayed on air for 169 hours in 2009.