Holy cow! He paddled 38 miles down the Missouri from Bellevue to Nebraska City in a >800-lb. Pumpkin he grew!
rivercountry.newschannelnebraska.com
The previous record was 25.5 miles:
www.guinnessworldrecords.com

Pumpkin grower paddles the river to set world's record
Hansen navigates with 800-pound pumpkin on the Missouri River

The previous record was 25.5 miles:

Man creates pumpkin boat then paddles 25 miles in it to set new record
One man in the US got a large pumpkin, hollowed it out, climbed in and then paddled 25 miles to set a new record for longest journey by pumpkin boat