How long was the time for the Legacy Fighting Championship 12?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "event" text,
  "round" real,
  "time" text,
  "location" text
);
SELECT "time" FROM "mixed_martial_arts_record" WHERE "event"='legacy fighting championship 12';