What is the time when the set 3 score is 31–29?
CREATE TABLE "pool_h" (
  "date" text,
  "time" text,
  "score" text,
  "set_1" text,
  "set_2" text,
  "set_3" text,
  "total" text
);
SELECT "time" FROM "pool_h" WHERE "set_3"='31–29';