Most consecutive days to run an official marathon (female)
According to Official Guinness Records,
The most marathons run on consecutive days by a female is 17 and was achieved by Iranian-born Parvaneh Moayedi (US), who completed all 17 marathons between 21st December 2012 and 6 January 2013 in various races held across Texas, USA. Parvaneh began by running the 'End of the World' Marathon in Humble, Texas, USA, on 21st December 2012. She completed her seventeenth and final marathon on the last day of the 'I Ran Marathons' Winter Festival in San Antonio, Texas, USA, on 6 January 2013. She completed her fastest marathon on the second day of the aforementioned five day festival, her fourteenth consecutive marathon at that point, registering a time of 4 hours 41 minutes.