According to Official Guinness Records,
The longest marathon curling is 105 hr 6 min 51 sec, achieved by Bill Pearce, Brittany Pearce, Amanda Pearce, Lauren Grealy, Michael Foster, Stephen Collins, Calvin Manley, Terry Lee, Jeremy Rand, and John Carpino (all Canada) in Coldwater, Ontario, Canada from 28 September to 2 October 2017. The team broke this record as part of a five-day fundraising event for Radio for Cardiology, a charity that raises funds to build a cardiac care unit at the Royal Victoria Hospital.
For a complete list of 2017 records, please visit 2017 Guinness Records in Canada.