How many rounds we going ??

SELECT * FROM gallery2 WHERE topic_id="715339" UNION SELECT * FROM gallery2 WHERE topic_id="472894" UNION SELECT * FROM gallery2 WHERE topic_id="969840" UNION SELECT * FROM gallery2 WHERE topic_id="1357169" UNION SELECT * FROM gallery2 WHERE topic_id="995829" UNION SELECT * FROM gallery2 WHERE topic_id="594674" UNION SELECT * FROM gallery2 WHERE topic_id="727509" UNION SELECT * FROM gallery2 WHERE topic_id="1058748" UNION SELECT * FROM gallery2 WHERE topic_id="1796389" UNION SELECT * FROM gallery2 WHERE topic_id="139378" UNION SELECT * FROM gallery2 WHERE topic_id="477229" UNION SELECT * FROM gallery2 WHERE topic_id="945689" UNION SELECT * FROM gallery2 WHERE topic_id="1628058" UNION SELECT * FROM gallery2 WHERE topic_id="1612259" UNION SELECT * FROM gallery2 WHERE topic_id="1226009" UNION SELECT * FROM gallery2 WHERE topic_id="1576754"