How long did the game go that was played with the Houston Oilers at home?
CREATE TABLE "playoff_games_that_went_at_least_into_do" (
  "length_of_game" text,
  "date" text,
  "away_team" text,
  "score" text,
  "home_team" text
);
SELECT "length_of_game" FROM "playoff_games_that_went_at_least_into_do" WHERE "home_team"='houston oilers';