Longest marathon tobogganing, steel

According to Official Guinness Records,

The record for the longest time spent riding a summer toboggan is 56 hours by Michael Kinzel (Germany) who rode the steel toboggan at Panorama Park in Kirchhundem, Germany from 4 to 6 May 2002.
A summer toboggan is also known as a roller-bob and is a combination between a bob-sled and a toboggan. It is ridden around a stainless steel course rather than on snow and the person rides it in an upright position, feet first. It is towed up the uphill sections of the course and free wheels down the majority which is downhill.

For a complete list of 2002 records, please visit 2002 Guinness Records in Germany.

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