What's the longest an iPhone 4 can charge before it turns on?

It's been dead for about 3 hours and it won't turn on. I've been charging it for 2 hours. The lockscreen top button is broken so I can't restart it.

Did you try pressing the home button, or specifically, holding the home button. To restart iPhones you need the top lock button, but there might be a way to also do it with one of the volume buttons (thats how some phones do it). But try unplugging it and then plugging it back in. But there's always the chance that the iPhone could be broken.

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