CREATE TABLE table_57237 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Round" TEXT, "Time" TEXT, "Location" TEXT)

What's the time for a round of n/a when the opponent is mikhail ilyukhin?
SELECT "Time" FROM table_57237 WHERE "Round" = 'n/a' AND "Opponent" = 'mikhail ilyukhin'
SELECT "Time" FROM "table_57237" WHERE "Opponent" = 'mikhail ilyukhin' AND "Round" = 'n/a'