Most people swimming one length in a 24 hour relay (60 ft pool)

According to Official Guinness Records,

The most participants to swim one length each in a 24 hour relay is 5,028 and was set by Swim For Children (Italy) at Padovanuoto, Padova, Italy, on 11-12 June 2010.
Youngest participant: 4 years old. Oldest participant: - 81 years old. More than 50,000 EUR (?41,000, $61,000) was raised for Paediatric Research Institute "Citt? della Speranza". Participants covered a distance of more than 92 km (57 mi).

For a complete list of 2010 records, please visit 2010 Guinness Records in Italy.

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