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The head-up tilt table test usually takes one to two hours to complete. However, that may vary depending on the changes observed in your blood pressure and heart rate and the symptoms you experience during the test. Before the test begins, a nurse will help you get ready. The nurse will start an IV (intravenous) line.
An official IQ test has to be administered in person ... the Wechsler-IV Adult Intelligence Test takes about an hour and a half to two hours. An average score is 100; test scores follow a bell curve, with a high concentration between 85 and 114 (68% of people), and very few scores at the ends of the curve. There isn't really an accurate test on the Internet ... you can take some to see what one is like; for example, Mensa has a test on their website.