page 124 of 960 of Sir Thomas Malory: Le Morte Darthur: The Definitive Original Text Edition

124:

Marhaus rides up and fights with one of these knights (who had previously took refuge in the tower). Marhaus kills the knight (and his horse). Marhaus now wants to joust Uwayne and Gawayne and so Uwayne goes first. Uwayne looses, so Gawayne has a go at it. Here we get mention of Gawayne’s great strength for 3 hours a day.