What's the time for a round of n/a when the opponent is mikhail ilyukhin?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "round" text,
  "time" text,
  "location" text
);
SELECT "time" FROM "mixed_martial_arts_record" WHERE "round"='n/a' AND "opponent"='mikhail ilyukhin';