How many rounds in a world title boxing fight?

There are usually 12 rounds in a world title fight.

12

since 1988 when the ibf became the last existing organisation to shortening their world title fights from 15 rounds, all title fights have been 12 rounders.

36 3 - minute rounds plus a minute rest between rounds. that's 17 minutes in total.

There are 11 rounds in chess boxing, six rounds of chess and five rounds of boxing. Each round of chess lasts four minutes and each round of boxing lasts three minutes.