CREATE TABLE table_5471 ("Res." CLOB, "Record" CLOB, "Opponent" CLOB, "Method" CLOB, "Event" CLOB, "Round" FLOAT, "Time" CLOB, "Location" CLOB)

What is the number of rounds that took place for the fight that lasted 6:21?
SELECT COUNT("Round") FROM table_5471 WHERE "Time" = '6:21'
SELECT COUNT("Round") FROM "table_5471" WHERE "Time" = '6:21'