Although we've set this as a time challenge - it's more a have you managed to do it or not! Don't forget this is an extremely hard challenge and shouldn't be attempted without proper risk assessment and safety cover.
This challenge is also organised annually by the Mayflower Offshore Rowing Club which is probably the best way to take on the challenge.
I've just been informed that next year's challenge will be taking place on Saturday 7th July 2012.