how many fights do i have to do in the valor arena dragon age veilguard?

You have to do 10 fights in the Hall of Valor to finish that quest in Dragon Age: The Veilguard. The arena itself can also be used for extra sparring beyond that, since one guide notes you can keep fighting there even after the quest is done.

Quick Scoop

• Main quest requirement: 10 matches/fights.

• After that: the Hall of Valor still allows unlimited practice fights.

What you get

Finishing all 10 fights rewards you with the Call of the Hall ring, 100 Lords of Fortune strength, a bond increase with Taash, the A Modest Brooch appearance, and the Dragon Skull Monument.

TL;DR: 10 fights to clear the quest, then you can keep using the arena for more battles.