Amateur boxing can be 3 rounds of 2 minutes, 4 rounds of 2 minutes, 3 rounds of 3 minutes.
Pro boxing when turning professional are 4 rounds of 3 minutes, 6 rounds of 3 minutes, 10 rounds of 3 minutes, 12 rounds of 3 minutes. They are always 3 minutes in pro boxing.
bout lengths vary. in the amateurs its mainly 3 x 2 min rounds. professionals normally start off with 6 x 3 mins then 8 then 10, as they gain experience in the pro ranks, then as they get toward contender level, the fights are normally 12 rounds. title fights will always be 12 rounds, but used to be 15 back in the day.
Amateur bouts are 2 minute rounds, and a 1 minute break. Pro bouts are 3 minute rounds, and a 1 minute break.
Depends. Shortest match ever recorded was 5 seconds. Longest was over 7 hours.
Are they 3 minutes long, 5 minutes long, or do they depend on the division the fighter is in?