Pugnacious upgrade

[yonman17]

In Chapter 3 a character with the Pugnacious trait gets an upgraded:
Pugnacious: As you regain your memories, you feel strong anger for those who wronged you during the period you couldn’t previously remember. You can’t get the image of Count Lowls’s face out of your head and it makes you shudder with rage while you plan your revenge. Once per day, you gain a +1 trait bonus on either attack rolls or weapon damage rolls for a single combat.

A single combat is that the duration of one round of combat or the entire combat until everyone is dead?

[The_Mothman]

A single combat usually means until the PCs are out of initiative/ This could be one round, this could be 10, it could be 100 if things go bad enough, but either way it is still a single combat.