The fastest combined time for three marathons in three days is 8 hr 11 min 8 sec by Johan Oosthuizen (SA) during the Lake Tahoe Triple marathon event in Lake Tahoe, Nevada, USA, from 28-30 September 2006

Times were:
Marathon #1 – 2:43:35
Marathon #2 – 2:43:31
Marathon #3 – 2:44:02