Fastest time to complete 10 marathons in 10 days (female)

According to Official Guinness Records,

The fastest 10 marathons in 10 days by a female is 36 hr 38 min 53 sec and was achieved by Sally Ford (UK) at the 2012 Brathay 10 in 10 Challenge in Brathay, Cumbria, UK, between 11-20 May 2012.
The Brathay 10 in 10 Challenge is an annual event held in Brathay, Cumbria, UK, that was started in 2007 by Sir Christopher Ball. Competitors run 10 marathons in 10 days over the Windermere Marathon course, with the tenth marathon being the actual Windermere Marathon itself. The current record holder of the male version of this category also ran the Brathay 10 in 10 Challenge to set the record.

For a complete list of 2012 records, please visit 2012 Guinness Records in United Kingdom.

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