- Yuko Matsuzaki
- 24:01 hour(s):minute(s)
- United States (Los Angeles)
The longest continuous swim in a counter-current pool is 24 hours 1 min, and was achieved by Yuko Matsuzaki (Japan) at the Seaside Lagoon in Redondo Beach, California, USA from 5 through 6 October 2019.
This attempt was observed and verified by members of the World Open Water Swimming Association.