The most likely answer is three rounds — in knight fighting rulesets, a bout is commonly scored over three 3-minute rounds with breaks between them.

If you meant the Roaring Knight fight in Deltarune , that’s different: guides describe it as a boss battle where you survive the attack patterns and then beat the boss, not a fixed “round count” like a boxing match.

Quick Scoop

  • Knight fighting sport: usually 3 rounds.
  • Deltarune Roaring Knight boss fight: no simple round count; it’s a boss battle with phases and attacks.

What people usually mean

A lot of searches for “knight fight” actually mix up:

  • A real medieval-style combat sport , which has rounds.
  • A video game boss named the Knight , which is about survival and strategy instead of rounds.

Bottom line

So the answer is 3 rounds if you mean the combat sport version. If you mean the game boss, there isn’t a standard number of rounds in the same sense.