To complete a 2-hour marathon, you would need to maintain a pace of 4 minutes and 34 seconds per mile. This pace is equivalent to 21.1 kilometers per hour (13.1 miles per hour) . Its worth noting that Eliud Kipchoge completed a marathon in under 2 hours with a pace of under 4 minutes and 34 seconds per mile, but this feat was not an official world record due to the ideal conditions and support he received.