context: The match lasted eight rounds, during which former world champion Muhammad Ali, who was underdog, tired his opponent by stepping on the ropes and letting him be exhausted. In the final leg of the fight, Ali knocked Foreman's canvas with a hit set in the face and won the World Championship with a knockout. With the victory, Ali became the second heavyweight boxer to win his once lost championship.
question: How long did Rumble in the Jungle last?
answers.text: eight rounds