According to Official Guinness Records,
The greatest distance run on a treadmill in 24 hours by a female team is 346.24 km (215.14 mi), and was achieved by Laura James, Lidia Scotto di Vetta, Lauren Hamilton, Renee Everett, Fiona Yates, Cathy Liu, Jacqueline O’Connor, Ruth McGuinness, Ellen Waterman, Cassandra Fien, Emily Donker and Sophie Ryan (all Australia) in Sydney, Australia, on 29 April 2017.The record attempt took place to raise donations for a children's cancer charity.
For a complete list of 2017 records, please visit 2017 Guinness Records in Australia.