According to Official Guinness Records,
The farthest distance travelled on a skateboard in 24 hours is 431.32 km (261.8 miles) and was achieved by Andrew Andras (USA) at the Homestead-Miami Speedway, Homestead, Florida, USA, on 7th-8th January 2013.
For a complete list of 2013 records, please visit 2013 Guinness Records in United States.