Just remembered I downloaded a demo before when Apple released the iPhone 3GS. It's called Epic Citadel and I believe it's made by the same devs as Infinity Blade. I reckon running the Guided Tour for a couple of hours should do the trick. Alas, I need my iPad tomorrow so I need to charge it and can't run stress tests right now.
For what it's worth, I was using my iPad as hotspot earlier for around 2 hours. It got slightly warm but not at all uncomfortable. Alas, didn't have a surface thermometers so wasn't able to measure temps.
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