I don't think this hack can be used to time individual queries, it only marks the time difference between the page request and when it is complete.
43 queries on a forumdisplay.php page seems like quite a bit of them. I just loaded the forumdisplay.php page on two forums I admin. The more customized one ran 26 queries on a forumdisplay, one that is a little closer to stock ran 21 queries. To figure out what is taking so long on yours, I'd disable all plug-ins, then re-enable them 1 by 1 until you see the page load time increase dramatically.
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