Johnson again averaged a double-double in the 1985-86 NBA season, with 18.8 points, 12.6 assists, and 5.9 rebounds per game. The 1985-86 Los Angeles Lakers season advanced to the 1986 NBA Playoffs, but were unable to defeat the 1985-86 Houston Rockets season, who advanced to the Finals in five games. In the 1986-87 NBA season, Johnson averaged a career-high of 23.9 points, as well as 12.2 assists and 6.3 rebounds per game, and earned his first NBA Most Valuable Player Award. The 1986-87 Los Angeles Lakers season met the 1986-87 Boston Celtics season for the third time in the 1987 NBA Finals, and in Game 4 Johnson hit a last-second hook shot over Celtics frontcourt Parish and Kevin McHale (basketball) to win the game 107-106. The game-winning shot, which Johnson dubbed his "junior, junior, junior hook shot", helped Los Angeles defeat Boston in six games. Johnson was awarded his third Finals MVP title after averaging 26.2 points on .541 shooting, 13.0 assists, 8.0 rebounds, and 2.33 steals per game.
Question: How many games did the 1987 NBA Finals between the Lakers and Celtics last?
Answer: 6