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there is a time limit of 5 days, and you can decide where and how long you want to stop or sleep, but the winners obviously sleep very little, maybe 1 or 2 hours here and there....

This is more insane than my bike packing tour. You did it? When and where? How to join?

haha... it's called The Munga, in South Africa. I have not done it yet, but I've entered for this November. I had a post on it recently: https://steemit.com/bicycle/@ultrabiker/the-munga-1-000-km-the-toughest-race-on-earth People do it mainly on a Mountain Bike, and some have a MTB with drop bars.

This is hard core. Unbelievable. I want to do it.