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I don't think any aeroplane of the period had enough fuel to run for 10 hours straight at +12, so I don't think you have to worry too much about the engine not getting rest between bouts of torture..
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The endurance trials were conducted over the course of many flights. It was not done on a test stand but on a Hurricane IIRC. The airplane flew multiple flights to accumulate time and the test ended when the engine failed ~10 hours of operation at +12lbs.