When Iphone dies how much time need charging to work again?

Friend of mine told me: "when IPhones die they don't come back on till they reach a sufficient charge"
Is this true? I never had an IPhone, just like to know, thanks!

For iPhone 4 in normal type of battery, it took me about 2hrs 45 min to 3hrs to charge from nil to 100% battery. When iPhone dies thy come back after 15-20 minutes to work again. In this time the charge will go up to 15-20%. Hope it helped you.

It's true. If the iPhone is totally discharged, it won't come back on until it has at least a little it of charge on it.

If the iPhone is totally discharged and is then left uncharged for a long period, the battery may discharge too far and suffer permanent damage, and then it won't charge at all. This is true for all smartphones with Li-ion batteries, not just iPhones.

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