Between 05:00 and 08:00, entrants leave Bolsward every eight minutes in batches of about 600 and those who complete the 240 km course before midnight receive medals. In 2013 the organisers banned Velomobiles from the event by limiting the event to two-wheeled vehicles propelled by human power. On March 27, 2019 Maarten van der Weijden, a Dutch long distance swimmer, announced that on June 21, 2019 he would start a second attempt to swim the whole eleven-city tour. His first attempt in August 2018 was halted due to poor swimming conditions and illness due to E. Coli. His second attempt turned out to be successful. Van der Weijden arrived at the finish in Leeuwarden on June 24, 2019. So far in this attempt he raised a total of € 3,910,763.11 for cancer charities.