[annoying_tech]

It's 10 seconds. And my PC does it too, and my 3DS, and my MP4 player,...

I don't know how much stuff you carry with you, but with my 5'5" phone doesn't reboot with my keys on my pocket.

[coldpie]

I'm a Type 1 Diabetic, so I carry a tube of glucose tablets with me at all times, about an inch in diameter of hard plastic. If the buttons on the phone are facing the tube, and I squat down to look at something or whatever for 10 seconds, things shift around such that the power button gets held and my phone reboots. Awesome.

[digi_owl]

It varies a bit between brands but usually fall between 5 and 10 seconds.