Anyone into size comparasion?

SELECT * FROM gallery2 WHERE topic_id="385820" UNION SELECT * FROM gallery2 WHERE topic_id="47504" UNION SELECT * FROM gallery2 WHERE topic_id="567680" UNION SELECT * FROM gallery2 WHERE topic_id="11584" UNION SELECT * FROM gallery2 WHERE topic_id="1048515" UNION SELECT * FROM gallery2 WHERE topic_id="1614895" UNION SELECT * FROM gallery2 WHERE topic_id="201045" UNION SELECT * FROM gallery2 WHERE topic_id="986727" UNION SELECT * FROM gallery2 WHERE topic_id="1585113" UNION SELECT * FROM gallery2 WHERE topic_id="512837" UNION SELECT * FROM gallery2 WHERE topic_id="529458" UNION SELECT * FROM gallery2 WHERE topic_id="1746231" UNION SELECT * FROM gallery2 WHERE topic_id="656630" UNION SELECT * FROM gallery2 WHERE topic_id="575664" UNION SELECT * FROM gallery2 WHERE topic_id="819116" UNION SELECT * FROM gallery2 WHERE topic_id="1352226"