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No idea, but it isn't instant on my single-tasking iPhone 3G either.

I wonder why is that? I've got a 3GS and most times it takes seconds to power down and other times it can take up yo 20 seconds or so.

Power up and power down are anachronisms too. Ideally a device powers up and powers down only once it its lifetime.

I've got a Samsung Galaxy S, only takes a couple of seconds after I hit the power off item to power down.