IntelBurnTest is more a Pass/Fail test. It has multiple stress levels, with "Standard" taking only a couple minutes. I usually OC until it doesn't pass standard, take it down, then if it passes on high it's good to go. I never bother with the number of passes, as the default of 10 seems to do just fine. 24 hours is just obnoxious, but I guess you could turn up the passes and max the stress level if you want to be anal.
Never had a single problem with a PC that has passed IntelBurnTest on at least high. Used it for OCing an FX-6300, FX-8350, and an i7 3770k with great results.