At least seven games, 90 minutes is not easy to get.
Step 1: 6 people are randomly divided into 3 groups and 3 games;
Step 2: Step 1, three winners draw lots, two players play against each other, and the winners are out, *** 1 game;
Step 3: Step 1: Three losers draw lots for two people to play, and the loser is out, *** 1 game.
Step 4: There are four people left in the first three steps. Take the winner of the first step as the seed to play against the other two people, and the winner is qualified for ***2 games.
* * * A total of 7 games.